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

#define rep(i, a, b) for (int i = (int)(a); (i) < (int)(b); (i)++)
#define rrep(i, a, b) for (int i = (int)(b) - 1; (i) >= (int)(a); (i)--)
#define all(v) v.begin(), v.end()

typedef long long ll;
template <class T> using V = vector<T>;
template <class T> using VV = vector<V<T>>;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    constexpr char endl = '\n';

    string s;
    cin >> s;
    VV<ll> v(26, V<ll>(s.size()));
    rep(i,0,s.size()) {
        v[s[i]-'A'][i]++;
        if (i != 0) {
            rep(j,0,26) {
                v[j][i] += v[j][i-1];
            }
        }
    }
    ll ans = 0;
    rep(i,1,s.size()-1) {
        ll lft = v[s[i]-'A'][i-1];
        ll rt = s.size() - i - 1 - v[s[i]-'A'][s.size()-1] + v[s[i]-'A'][i];
        ans += lft * rt;
    }
    cout << ans << endl;
    return 0;
}