#include <bits/stdc++.h>
using namespace std;
int main() {
  map<char, long long> m;
  map<char, long long>::iterator ite;
  string s;
  while (getline(cin, s)) {
    for (int i = 0; i < s.size(); i++) {
      ite = m.find(s[i]);
      if (ite != m.end()) {
        (*ite).second++;
      } else {
        m[s[i]] = 1;
      }
    }
    long long x = 0;
    for (ite = m.begin(); ite != m.end(); ite++) {
      x += ((*ite).second * (*ite).second);
    }
    cout << x << endl;
    m.clear();
  }
  return 0;
}
