class Solution:
    def lengthOfLongestSubstring(self, s: str) -> int:
        if len(s) == 0:
            return 0
        result = 1
        length_str = len(s)
        s = list(s)
        a = 0
        while True:
            a += 1
            if len(s) != length_str:
                length_str = len(s)
                a = 1
            if a == len(s) or result == 95:
                return result
            tmp = 1
            for k in range(0, a):
                if len(s) == 1:
                    return result if result > 1 else 1
                if s[k] == s[a]:
                    s = s[k+1:]
                    break
                else:
                    tmp += 1
                if tmp > result:
                    result = tmp