Problem: 

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

Solution (in PYTHON3):

Solution:
import sys 
from collections import defaultdict as dd
from collections import Counter as cc
from queue import Queue
import math
import itertools
import functools
from operator import ixor
from decimal import Decimal
try:
    sys.stdin = open('input.txt', 'r') 
    sys.stdout = open('output.txt', 'w')
except:
    pass
input = lambda: sys.stdin.readline().rstrip()



a='ABCDEFGHIJKLMNOPQRSTUVWXYZ'
q=input()
w=1
e=[0]*len(q)
j=0
for i in range(26):
	for j in range(len(q)):
		if a[i]==q[j]:
			e[j]=(i)
for i in range(2,len(q)):
	if e[i]!=(e[i-1]+e[i-2])%26:
		w=0
		break
if w==0:
	print('NO')
else:
	print('YES')