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import collections

from typing import Deque

class Solution:

def isPalindrome(self, s: str) -> bool:

# 자료형 데크로 선언

strs: Deque = collections.deque()

for char in s:

if char.isalnum():

strs.append(char.lower())

while len(strs) > 1:

if strs.popleft() != strs.pop():

return False

return True