Problem: 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.

Examples

Input

great10


Output

7


Input

aaaaaaaaaa


Output

100

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
char str[1000000];
long long arr[512];
int main(void) {
  scanf("%s", str);
  int len = strlen(str);
  for (int i = 0; i < len; i++) {
    arr[str[i]]++;
  }
  long long cont = len;
  for (int i = 0; i < 512; i++) {
    if (arr[i] > 1) cont += arr[i] * (arr[i] - 1);
  }
  cout << cont << "\n";
  return 0;
}