kindness

//#include<bits/stdc++.h>
#include<iostream>
#include<map>

#define long long long
#define nln '\n'

using namespace std;

int main()
{
    string str;
    cin >> str;
    long ans = str.size()*(str.size()-1)/2;
    map<char, long> dtn;
    for (const auto &i : str)
    {
        ans -= dtn[i];
        ++dtn[i];
    }
    cout << ans + (long)(dtn.size() < str.size());
    return 0;
}