Given a string, determine the minimum number of characters that need to be deleted such that there are only one or two distinct letters remaining.

Constraints

~1 \le N \le 100~

The string only consists of lowercase letters.

Input Specification

The input consists of a single string of length ~N~.

Output Specification

Print, on a single line, the minimum number of characters to be deleted.

Sample Input 1

abc

Sample Output 1

1

Sample Input 2

aab

Sample Output 2

0