#include <bits/stdc++.h>
using namespace std;

int main() {
  string S; cin >> S;
  int N = S.size();
  long long Ans = 0;

  for (int i = 'A'; i <= 'Z'; i++) {
    int MM_Count = 0, A_Count = 0;
    
    for (int j = 0; j < N; j++) {
      if (S.at(j) == i) {
        Ans += (long long)MM_Count * (MM_Count - 1) / 2 * A_Count;
        A_Count = 0;
        MM_Count++;
      }
      else A_Count++;
    }
    
    Ans += (long long)MM_Count * (MM_Count - 1) / 2 * A_Count;
  }

  cout << Ans << endl;
}