#include<bits/stdc++.h>
using namespace std;
using ll = long long;
int main(){
	string S; cin >> S;
	int N = S.size();
	vector<vector<int>> A(26);
	vector<int> inv(N),banme(N);
	for(int i = 0; i < N; i++){
		int c = S[i] - 'A';
		A[c].push_back(i);
		inv[i] = c;
		banme[i] = A[c].size();
	}
	ll ans = 0;
	for(int i = 0; i < N; i++){
		ll fr = banme[i] - 1;
		ll bk = N - 1 - i - (A[inv[i]].size() - banme[i]);
		ans += fr * bk;
	}
	cout << ans << endl;
}