

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.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.InputMismatchException;

public class F {
	private static int n;
	private static int[] a;
	private static String s;
	private static String[] words;

	public static void main(String[] args) {
		words = 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",

		};
		s = in.readString().toLowerCase();
		n = s.length();
		
		println(solve(0)?"YES":"NO");

		out.flush();
		out.close();

	}
	
	private static boolean solve(int i) {
		if (i==n) {
			return true;
		}
		
		boolean ans = false;
		
		for(int j=0; j<words.length; j++) {
			if (words[j].toLowerCase().equals(""+s.charAt(i))) {
				ans = ans || solve(i+1);
			}
		}
		if (i+1<n)
			for(int j=0; j<words.length; j++) {
				String next = ""+s.charAt(i)+""+s.charAt(i+1);
//				println(next);
				if (words[j].toLowerCase().equals(next)) {
					ans = ans || solve(i+2);
				}
			}
		
		return ans;
	}

	//NONPROBLEM CODE

	private static InputReader in = new InputReader(System.in);
	private static PrintWriter out = new PrintWriter(System.out);

	private static class InputReader {

		private final InputStream stream;
		private final byte[] buf = new byte[8192];
		private int curChar, snumChars;

		public InputReader(InputStream st) {
			this.stream = st;
		}

		public int read() {
			if (snumChars == -1)
				throw new InputMismatchException();
			if (curChar >= snumChars) {
				curChar = 0;
				try {
					snumChars = stream.read(buf);
				} catch (IOException e) {
					throw new InputMismatchException();
				}
				if (snumChars <= 0)
					return -1;
			}
			return buf[curChar++];
		}

		public int nextInt() {
			int c = read();
			while (isSpaceChar(c)) {
				c = read();
			}
			int sgn = 1;
			if (c == '-') {
				sgn = -1;
				c = read();
			}
			int res = 0;
			do {
				res *= 10;
				res += c - '0';
				c = read();
			} while (!isSpaceChar(c));
			return res * sgn;
		}

		public long nextLong() {
			int c = read();
			while (isSpaceChar(c)) {
				c = read();
			}
			int sgn = 1;
			if (c == '-') {
				sgn = -1;
				c = read();
			}
			long res = 0;
			do {
				res *= 10;
				res += c - '0';
				c = read();
			} while (!isSpaceChar(c));
			return res * sgn;
		}

		public int[] nextIntArray(int n) {
			int a[] = new int[n];
			for (int i = 0; i < n; i++) {
				a[i] = nextInt();
			}
			return a;
		}

		public String readString() {
			int c = read();
			while (isSpaceChar(c)) {
				c = read();
			}
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isSpaceChar(c));
			return res.toString();
		}

		public String nextLine() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isEndOfLine(c));
			return res.toString();
		}

		public boolean isSpaceChar(int c) {
			return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
		}

		private boolean isEndOfLine(int c) {
			return c == '\n' || c == '\r' || c == -1;
		}

	}

	//INPUT SHORTCUTS

	private static int[] ina(int n) {
		int[] temp = new int[n];
		for (int i = 0; i < n; i++) {
			temp[i] = in.nextInt();
		}
		return temp;
	}

	private static int ini() {
		return in.nextInt();
	}

	//OTHER SHORTCUTS
	public static void sort(int[] a) {
		Arrays.sort(a);
	}

	//PRINT SHORTCUTS

	private static void println(Object... o) {
		for (Object x : o) {
			out.write(x + " ");
		}
		out.write("\n");
		out.flush();
	}

	private static void print(Object... o) {
		for (Object x : o) {
			out.write(x + " ");
		}
		out.flush();
	}

	private static void debug(Object... o) {
		for (Object x : o) {
			out.write(x + " ");
		}
		out.write("\n");
		out.flush();
	}

	private static HashMap<Integer, ArrayList<Integer>> intree(int n) {

		HashMap<Integer, ArrayList<Integer>> g = new HashMap<>();
		for (int i = 0; i < n; i++) {
			g.put(i, new ArrayList<>());
		}

		for (int i = 0; i < n - 1; i++) {
			int u = ini() - 1;
			int v = ini() - 1;
			g.get(u).add(v);
			g.get(v).add(u);
		}

		return g;
	}
}
