#include <bits/stdc++.h>
using namespace std;
int main(){
  string S;
  cin >> S;
  int N = S.size();
  long long ans = 0;
  vector<int> cnt(26, 0);
  for (int i = 0; i < N; i++){
    int p = S[i] - 'A';
    ans += (long long) cnt[p] * (N - 1 - i);
    cnt[p]++;
  }
  for (int i = 0; i < 26; i++){
    ans -= (long long) cnt[i] * (cnt[i] - 1) * (cnt[i] - 2) / 6;
  }
  cout << ans << endl;
}