

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.IOException;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.InputStreamReader;
import java.io.FileNotFoundException;
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;
        FastScanner in = new FastScanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        FElementarno solver = new FElementarno();
        solver.solve(1, in, out);
        out.close();
    }

    static class FElementarno {
        public void solve(int testNumber, FastScanner in, PrintWriter out) {
            String[] list = new String[]{"Ac",
                    "Ag",
                    "Al",
                    "Am",
                    "Ar",
                    "As",
                    "At",
                    "Au",
                    "B",
                    "Ba",
                    "Be",
                    "Bh",
                    "Bi",
                    "Bk",
                    "Br",
                    "C",
                    "Ca",
                    "Cd",
                    "Ce",
                    "Cf",
                    "Cl",
                    "Cm",
                    "Cn",
                    "Co",
                    "Cr",
                    "Cs",
                    "Cu",
                    "Db",
                    "Ds",
                    "Dy",
                    "Er",
                    "Es",
                    "Eu",
                    "F",
                    "Fe",
                    "Fl",
                    "Fm",
                    "Fr",
                    "Ga",
                    "Gd",
                    "Ge",
                    "H",
                    "He",
                    "Hf",
                    "Hg",
                    "Ho",
                    "Hs",
                    "I",
                    "In",
                    "Ir",
                    "K",
                    "Kr",
                    "La",
                    "Li",
                    "Lr",
                    "Lu",
                    "Lv",
                    "Mc",
                    "Md",
                    "Mg",
                    "Mn",
                    "Mo",
                    "Mt",
                    "N",
                    "Na",
                    "Nb",
                    "Nd",
                    "Ne",
                    "Nh",
                    "Ni",
                    "No",
                    "Np",
                    "O",
                    "Og",
                    "Os",
                    "P",
                    "Pa",
                    "Pb",
                    "Pd",
                    "Pm",
                    "Po",
                    "Pr",
                    "Pt",
                    "Pu",
                    "Ra",
                    "Rb",
                    "Re",
                    "Rf",
                    "Rg",
                    "Rh",
                    "Rn",
                    "Ru",
                    "S",
                    "Sb",
                    "Sc",
                    "Se",
                    "Sg",
                    "Si",
                    "Sm",
                    "Sn",
                    "Sr",
                    "Ta",
                    "Tb",
                    "Tc",
                    "Te",
                    "Th",
                    "Ti",
                    "Tl",
                    "Tm",
                    "Ts",
                    "U",
                    "V",
                    "W",
                    "Xe",
                    "Y",
                    "Yb",
                    "Zn",
                    "Zr",};

            String input = in.next();
            boolean[] can = new boolean[input.length() + 1];
            can[0] = true;
            for (int i = 0; i < input.length(); i++) {
                if (can[i]) {
                    for (String elem : list) {
                        if (input.substring(i).startsWith(elem.toUpperCase())) {
                            can[i + elem.length()] = true;
                        }
                    }
                }
            }
            out.println(can[input.length()] ? "YES" : "NO");
        }

    }

    static class FastScanner {
        public BufferedReader br;
        public StringTokenizer st;

        public FastScanner(InputStream in) {
            br = new BufferedReader(new InputStreamReader(in));
        }

        public FastScanner(String fileName) {
            try {
                br = new BufferedReader(new FileReader(fileName));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }

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

    }
}

