#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<ll> sum(1010,0), cnt(1010,0);
    for(auto c : S) sum[c]++;

    ll ans = 0;
    for(int i = 0; i < N; ++i) {
        ans += cnt[S[i]]*(N-i-sum[S[i]]+cnt[S[i]]);
        cnt[S[i]]++;
    }

    cout << ans << endl;

}