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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