# -*- coding:utf-8 -*-

 class Solution:

     def FirstNotRepeatingChar(self, s):

         # write code here

         word_dic={}

         for i in range(len(s)):

             if s[i] not in word_dic:

                 word_dic[s[i]]=1

             else:

                 word_dic[s[i]]+=1

         for i in range(len(s)):

             if word_dic[s[i]]==1:

                 return i

         return -1