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;
const int MAX = 256;
long long func[MAX];
int main() {
  string input;
  cin >> input;
  for (int i = 0; i < MAX; i++) func[i] = 0;
  int n = input.length();
  long long result = 0;
  for (int i = n - 1; i >= 0; i--) {
    func[input[i]]++;
  }
  for (int i = 0; i < MAX; i++) result += func[i] * func[i];
  cout << result;
}