Petya once wrote a sad love song and shared it to Vasya. The song is a string consisting of lowercase English letters. Vasya made up q questions about this song. Each question is about a subsegment of the song starting from the l-th letter to the r-th letter. Vasya considers a substring made up from characters on this segment and repeats each letter in the subsegment k times, where k is the index of the corresponding letter in the alphabet. For example, if the question is about the substring "abbcb", then Vasya repeats letter 'a' once, each of the letters 'b' twice, letter 'c" three times, so that the resulting string is "abbbbcccbb", its length is 10. Vasya is interested about the length of the resulting string.

Help Petya find the length of each string obtained by Vasya.

Input

The first line contains two integers n and q (1≤ n≤ 100 000, 1≤ q ≤ 100 000) — the length of the song and the number of questions. 

The second line contains one string s — the song, consisting of n lowercase letters of English letters.

Vasya's questions are contained in the next q lines. Each line contains two integers l and r (1 ≤ l ≤ r ≤ n) — the bounds of the question.

Output

Print q lines: for each question print the length of the string obtained by Vasya.

Examples

Input


7 3
abacaba
1 3
2 5
1 7


Output


4
7
11


Input


7 4
abbabaa
1 3
5 7
6 6
2 4


Output


5
4
1
5


Input


13 7
sonoshikumiwo
1 5
2 10
7 7
1 13
4 8
2 5
3 9


Output


82
125
9
191
62
63
97

Note

In the first example Vasya is interested in three questions. In the first question Vasya considers the substring "aba", that transforms to "abba", so the answer is equal to 4. In the second question Vasya considers "baca", that transforms to "bbaccca", so the answer is 7. In the third question Vasya considers the string "abacaba",that transforms to "abbacccabba" of length 11.
//This code is written by प्रविण शंखपाळ 

//package wizard;

import java.io.*;
import java.util.*;

public class Ginny_Weasley {

	static long mod = (long) 1e9 + 7;

	public static void main(String[] args) {

//		try {

		FastReader fr = new FastReader();
		PrintWriter pt = new PrintWriter(System.out);

		int t = 1;

		while (t > 0) {

			int n = fr.nextInt(), q = fr.nextInt();
			String str = fr.next();

			long dp[] = new long[n + 1];

			dp[0] = 0;

			for (int i = 1; i <= str.length(); i++) {
				dp[i] = dp[i - 1] + ((str.charAt(i - 1) - 'a') + 1);
			}

			while (q > 0) {

				int l = fr.nextInt(), r = fr.nextInt();
				l--;

				pt.println(dp[r] - dp[l]);

				q--;
			}

			t--;
		}

		pt.close();

//		} catch (
//
//		Exception e) {
//			return;
//		}
	}

	static int lower_bound(long[] arr, int begin, int end, long tar) {
		while (begin < end) {
			int mid = begin + (end - begin) / 2;
			if (arr[mid] < tar)
				begin = mid + 1;
			else if (arr[mid] >= tar)
				end = mid;
		}
		return begin;
//		lower bound gives largest index of a number smaller than (if target is not present) or equal to target(if target is present) 
//      for complete array use begin = 0 and end = n
	}

	static int upper_bound(long[] arr, int begin, int end, long tar) {
		while (begin < end) {
			int mid = begin + (end - begin) / 2;
			if (arr[mid] <= tar)
				begin = mid + 1;
			else if (arr[mid] > tar)
				end = mid;
		}

		return begin;
//		upper bound gives smallest index of a number strictly greater than target
//	    for complete array use begin = 0 and end = n
	}

	static class Triple implements Comparable<Triple> {
		int a, b, c;

		Triple(int a, int b, int c) {
			this.a = a;
			this.b = b;
			this.c = c;
		}

		public int compareTo(Triple o) {
			// TODO Auto-generated method stub
			if (this.a != o.a)
				return Long.compare(this.a, o.a);
			else
				return Long.compare(this.b, o.b);
			// return 0;
		}

		public boolean equals(Object o) {
			if (o instanceof Pair) {
				Pair p = (Pair) o;
				return p.a == a && p.b == b;
			}
			return false;
		}

	}

	static class Pairx<Pairx> {

		int a;
		String b;

		Pairx(int a, String b) {
			this.a = a;
			this.b = b;
		}

	}

	static void merge(long arr[], int l, int m, int r) {

		int n1 = m - l + 1;
		int n2 = r - m;

		long L[] = new long[n1];
		long R[] = new long[n2];

		for (int i = 0; i < n1; ++i)
			L[i] = arr[l + i];
		for (int j = 0; j < n2; ++j)
			R[j] = arr[m + 1 + j];

		int i = 0, j = 0;

		int k = l;
		while (i < n1 && j < n2) {
			if (L[i] <= R[j]) {
				arr[k] = L[i];
				i++;
			} else {
				arr[k] = R[j];
				j++;
			}
			k++;
		}

		while (i < n1) {
			arr[k] = L[i];
			i++;
			k++;
		}

		while (j < n2) {
			arr[k] = R[j];
			j++;
			k++;
		}
	}

	static void sort(long arr[], int l, int r) {
		if (l < r) {

			int m = l + (r - l) / 2;

			sort(arr, l, m);
			sort(arr, m + 1, r);

			merge(arr, l, m, r);
		}
	}

	static class Pair implements Comparable<Pair> {
		int a, b;

		Pair(int a, int b) {
			this.a = a;
			this.b = b;
		}

		public int compareTo(Pair o) {
			// TODO Auto-generated method stub
			if (this.a != o.a)
				return Long.compare(this.a, o.a);
			else
				return Long.compare(this.b, o.b);
			// return 0;
		}

		public boolean equals(Object o) {
			if (o instanceof Pair) {
				Pair p = (Pair) o;
				return p.a == a && p.b == b;
			}
			return false;
		}

	}

	static int binarySearch(long arr[], int first, int last, long key) {
		int mid = (first + last) / 2;
		while (first <= last) {
			if (arr[mid] < key) {
				first = mid + 1;
			} else if (arr[mid] == key) {
				return mid;
			} else {
				last = mid - 1;
			}
			mid = (first + last) / 2;
		}
//		return -1;
		return mid;
//		return mid if want to find key greater than or less than arr[mid] if exact value is not given
	}

	static class FastReader {
		BufferedReader br;
		StringTokenizer st;

		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}

		String next() {
			while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}

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

		long nextLong() {
			return Long.parseLong(next());
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		String nextLine() {
			String str = "";
			try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return str;
		}
	}
}