leetcode 3120. Count the Number of Special Characters I

https://leetcode.com/problems/count-the-number-of-special-characters-i/description/

 

class Solution:
    def numberOfSpecialChars(self, word: str) -> int:
        answer = 0
        for i in range(26):
            if chr(i + 97) in word and chr(i + 97).upper() in word:
                answer += 1
        
        return answer