Good String
Problem
Given a string S, print the minimum number of characters you have to remove from the string S to make it a good string. A good string is a string in which all the characters are distinct.
Input:
First line of input contains a string S, (1≤|S|≤105). S consists of lowercase characters only.
Output:
Print an integer denoting the minimum number of characters you have to remove from S to make it a good string.
Time Limit: 1
Memory Limit: 256
Source Limit:
Explanation
We can make S a good string by removing one of the two a.
