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CCC 2013 J2: Rotating Letters


Using a boolean to determine if the input is "NO" or "YES"


word = input()
flag = True
for i in range(len(word)):
    if word[i] != "I" and word[i] != "O" and word[i] != "S"\ 
    and word[i] != "H" and word[i] != "Z" and word[i] != "X"\
    and word[i] != "N":
        flag = False
        break
if flag:
    print("YES")
else:
    print("NO")

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