You are given a sequence a1, a2, ..., an of one-dimensional segments numbered 1 through n. Your task is to find two distinct indices i and j such that segment ai lies within segment aj.

Segment [l1, r1] lies within segment [l2, r2] iff l1 ≥ l2 and r1 ≤ r2.

Print indices i and j. If there are multiple answers, print any of them. If no answer exists, print -1 -1.

Input

The first line contains one integer n (1 ≤ n ≤ 3·105) — the number of segments.

Each of the next n lines contains two integers li and ri (1 ≤ li ≤ ri ≤ 109) — the i-th segment.

Output

Print two distinct indices i and j such that segment ai lies within segment aj. If there are multiple answers, print any of them. If no answer exists, print -1 -1.

Examples

Input

5
1 10
2 9
3 9
2 3
2 9


Output

2 1


Input

3
1 5
2 6
6 20


Output

-1 -1

Note

In the first example the following pairs are considered correct:

  * (2, 1), (3, 1), (4, 1), (5, 1) — not even touching borders; 
  * (3, 2), (4, 2), (3, 5), (4, 5) — touch one border; 
  * (5, 2), (2, 5) — match exactly. 
import java.io.*;
import java.util.*;

public class Solution {

	public static void main(String[] args) throws IOException {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		OutputWriter out = new OutputWriter(outputStream);
		Task task = new Task();
		int t = 1;
		for (int i = 1; i <= t; i++) task.solve(i, in, out);
		out.close();
	}

	static class Task {
		
		public void solve(int testNumber, InputReader in, OutputWriter out) throws IOException {
			int n = in.nextInt();
			Pair[] a = new Pair[n];
			for (int i = 0; i < n; i++) a[i] = new Pair(in.nextInt(), in.nextInt(), i + 1);
			Arrays.sort(a);
			int x = -1, y = -1;
			for (int i = 0; i < n - 1; i++) {
				if (a[i].s >= a[i + 1].s) {
					x = a[i + 1].t;
					y = a[i].t;
					break;
				}
			}
			out.println(x, y, " ");
		}
	}
	
	static class Pair implements Comparable<Pair> {   	
      	int f, s, t;
	        	
	    public Pair(int f, int s) {
    			this.f = f;
			this.s = s;
		}
	    
	    public Pair(int f, int s, int t) {
	    		this.f = f;
			this.s = s;
			this.t = t;
		}
	    
	    @Override
	    public int compareTo(Pair o) {
		    	if (o.f < f) return 1;
	    		else if (o.f == f) {
	    			if (o.s < s) return -1;
	    			else return 1;
	    		} else return -1;
	    }
	    
	    @Override
	    public boolean equals(Object obj) {
		    	if (obj instanceof Pair) {
		    		Pair p = (Pair) obj;
		    		return p.f == f && p.s == s;
		    	}
		    	return false;
	    }
	    
	    @Override
	    public String toString() {
	    		return "{" + f + ", " + s + ", " + t + "}";
	    }
    }
	
	static class InputReader {
		private BufferedReader reader;
		private StringTokenizer tokenizer;

		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}
		
		private void tokenize() {
			while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
		}

		public String next() {
			tokenize();
			return tokenizer.nextToken();
		}

		public int nextInt() {
			return Integer.parseInt(next());
		}

		public long nextLong() {
			return Long.parseLong(next());
		}
		
		public char nextChar() {
			return next().charAt(0);
		}
		
		public float nextFloat() {
			return Float.parseFloat(next());
		}
		
		public double nextDouble() {
			return Double.parseDouble(next());
		}

		public int[] nextIntArray(int size, int a) {
			tokenize();
			int[] arr=new int[size];
			for(int i = a; i < size; i++) {
				tokenize();
				arr[i] = Integer.parseInt(tokenizer.nextToken());
			}
			return arr;
		}
		
		public long[] nextLongArray(int size, int a) {
			tokenize();
			long[] arr=new long[size];
			for(int i = a; i < size; i++) {
				tokenize();
				arr[i] = Long.parseLong(tokenizer.nextToken());
			}
			return arr;
		}
		
		public float[] nextFloatArray(int size, int a) {
			tokenize();
			float[] arr=new float[size];
			for(int i = a; i < size; i++) {
				tokenize();
				arr[i] = Float.parseFloat(tokenizer.nextToken());
			}
			return arr;
		}

		public double[] nextDoubleArray(int size, int a) {
			tokenize();
			double[] arr=new double[size];
			for(int i = a; i < size; i++) {
				tokenize();
				arr[i] = Double.parseDouble(tokenizer.nextToken());
			}
			return arr;
		}

		public String[] nextStringArray(int size, int a) throws IOException {
			String[] arr=new String[size];
			for(int i = a; i < size; i++) 
				arr[i] = reader.readLine();
			return arr;
		}

		public char[] nextCharArray() throws IOException {
			return reader.readLine().toCharArray();
		}
	}

	static class OutputWriter {
		public PrintWriter pw;

		public OutputWriter(OutputStream stream) {
			pw = new PrintWriter(stream);
		}
		
		public void println(Object... obj) {
			if (obj.length == 0) pw.println();
			else {
				String delimiter = (String) obj[obj.length - 1];
				for (int i = 0 ; i < obj.length - 1; i++) pw.print(obj[i] + delimiter);
			}
		}

		public void close() {
			pw.close();
		}

		public void flush() {
			pw.flush();
		}

		public void printStringArray(String[] arr, int a, int b, String delimiter) {
			for(int i = a; i < b; i++)
				pw.println(arr[i]);
			pw.println();
		}
		
		public void printBooleanArray(boolean[] arr, int a, int b, String delimiter) {
			for(int i = a; i < b; i++)
				pw.print(arr[i] + delimiter);
			pw.println();
		}

		public void printIntArray(int[] arr, int a, int b, String delimiter) {
			for(int i = a; i < b; i++)
				pw.print(arr[i] + delimiter);
			pw.println();
		}

		public void printLongArray(long[] arr, int a, int b, String delimiter) {
			for(int i = a; i < b; i++)
				pw.print(arr[i] + delimiter);
			pw.println();
		}

		public void printCharArray(char[] arr, int a, int b, String delimiter) {
			for(int i = a; i < b; i++)
				pw.print(arr[i] + delimiter);
			pw.println();
		}

		public void printFloatArray(float[] arr, int a, int b, String delimiter) {
			for(int i = a; i < b; i++)
				pw.print(arr[i] + delimiter);
			pw.println();
		}

		public void printDoubleArray(double[] arr, int a, int b, String delimiter) {
			for(int i = a; i < b; i++)
				pw.print(arr[i] + delimiter);
			pw.println();
		}
		
		public void printIntArrayList(ArrayList<Integer> arr, int a, int b, String delimiter) {
			for(int i = a; i < b; i++)
				pw.print(arr.get(i) + delimiter);
			pw.println();
		}
		
		public void printLongArrayList(ArrayList<Long> arr, int a, int b, String delimiter) {
			for(int i = a; i < b; i++)
				pw.print(arr.get(i) + delimiter);
			pw.println();
		}
		
		public void printStringArrayList(ArrayList<String> arr, int a, int b, String delimiter) {
			for(int i = a; i < b; i++)
				pw.print(arr.get(i) + delimiter);
			pw.println();
		}
	}
}
