

Input

The input consists of a single string of uppercase letters A-Z. The length of the string is between 1 and 10 characters, inclusive.

Output

Output "YES" or "NO".

Examples

Input


GENIUS


Output


YES


Input


DOCTOR


Output


NO


Input


IRENE


Output


YES


Input


MARY


Output


NO


Input


SMARTPHONE


Output


NO


Input


REVOLVER


Output


YES


Input


HOLMES


Output


NO


Input


WATSON


Output


YES
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        CFibonacciWords solver = new CFibonacciWords();
        solver.solve(1, in, out);
        out.close();
    }

    static class CFibonacciWords {
        char[] arr;

        public void readInput(Scanner sc) {
            arr = sc.next().toCharArray();
        }

        public void solve(int testNumber, Scanner sc, PrintWriter pw) {
            int q = 1;
            while (q-- > 0) {
                readInput(sc);
                boolean f = true;
                for (int i = 2; i < arr.length; i++) {
                    f &= arr[i] - 'A' == (arr[i - 1] - 'A' + arr[i - 2] - 'A') % 26;
                }
                pw.println(f ? "YES" : "NO");
            }
        }

    }

    static class Scanner {
        StringTokenizer st;
        BufferedReader br;

        public Scanner(InputStream s) {
            br = new BufferedReader(new InputStreamReader(s));
        }

        public String next() {
            try {
                while (st == null || !st.hasMoreTokens())
                    st = new StringTokenizer(br.readLine());
                return st.nextToken();
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }

    }
}

