Choosing Symbol Pairs

2000ms

262144K

Description:

There is a given string S consisting of N symbols. Your task is to find the number of ordered pairs of integers i and j such that

1. 1 ≤ i, j ≤ N

2. S[i] = S[j], that is the i-th symbol of string S is equal to the j-th.

Input:

The single input line contains S, consisting of lowercase Latin letters and digits. It is guaranteed that string S in not empty and its length does not exceed 10⁵.

Output:

Print a single number which represents the number of pairs i and j with the needed property. Pairs (x, y) and (y, x) should be considered different, i.e. the ordered pairs count.

Sample Input:

great10

Sample Output:

Sample Input:

aaaaaaaaaa

Sample Output:

Informação

Provedor Codeforces

Código CF50B