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

typedef long long ll;
//typedef modint1000000007 mint;
const int MOD = 1000000007;
#define all(x) x.begin(), x.end()
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
const int inf = 1 << 30;
const ll INF = 1LL << 60;
const int dx[8] = {1, 0, -1, 0, -1, -1, 1, 1};
const int dy[8] = {0, 1, 0, -1, -1, 1, -1, 1};
template <class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return 1; } return 0; }
template <class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return 1; } return 0; }

int main(){
    string s;
    cin >> s;

    vector<vector<int>> vec(s.size() + 1, vector<int>(26, 0));
    rep(i, s.size()) vec[i][s[i] - 'A']++;
    rep(i, s.size()) rep(j, 26) vec[i + 1][j] += vec[i][j];

    //後ろの一文字を決める
    ll ans = 0;
    rep(i, 26){
        rep(j, s.size()){
            if(s[j] == 'A' + i){
                rep(k, 26){
                    if(i != k) ans += vec[j][k] * (vec[j][k] - 1);
                }
            }
        }
    }


    cout << ans / 2 << endl;

    return 0;
}