회문(palindrome)

S1 = "level"
S2 = "korea"
n = len(S1)

def palindrome(S):
    for x in range(n):
        if S[x] != S[n-x-1]:
            return False
    return True

# 제한이 여유 있을 때
def simple_palindrome(S):
    if S != S[::-1]:
        return False
    return True

print(palindrome(S1)) # True
print(simple_palindrome(S1)) # True

print(palindrome(S2)) # False
print(simple_palindrome(S2)) # False