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#!/usr/bin/env python
class Solution:
def isValid(self, s: str) -> bool:
stack = []
for char in s:
if char == "(":
stack.append("(")
elif char == "[":
stack.append("[")
elif char == "{":
stack.append("{")
elif char == ")":
if len(stack) == 0:
return False
if stack[-1] == "(":
stack.pop()
else:
return False
elif char == "]":
if len(stack) == 0:
return False
if stack[-1] == "[":
stack.pop()
else:
return False
elif char == "}":
if len(stack) == 0:
return False
if stack[-1] == "{":
stack.pop()
else:
return False
if len(stack) != 0:
return False
return True
def main() -> None:
solution = Solution()
if __name__ == "__main__":
main()
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