#define _USE_MATH_DEFINES
#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <queue>
#include <math.h>
#include <cmath>
#include <stack>
#include <map>
#include <set>
#include <numeric>
#include <iomanip>
#include <climits>
#include <functional>
#include <cassert>
#include <tuple>
using namespace std;
using ll = long long;

string S;

int main() {

    cin >> S;
    int N = S.size();
    vector<vector<int>> cnt(1010);
    for(int i = 0; i < N; ++i) cnt[S[i]].push_back(i);
    ll ans = 0;
    for(int i = 'A'; i <= 'Z'; ++i) {
        int n = cnt[i].size();
        for(int j = 0; j < n; ++j) {
            ans += j*(N-cnt[i][j]-n+j);
        }
    }

    cout << ans << endl;

}