# -*- coding:utf-8 -*-
class Solution:
    def FirstNotRepeatingChar(self, s):
        # write code here
# 方法一:
#         for i in range(len(s)):
#             res = s[:i] + s[i + 1:]
#             if s[i] not in res:
#                 return i 
#         else:
#             return -1
# 方法二:
          for i in s:
            if s.count(i) == 1:
                return s.index(i)
          else:
            return -1