#include <bits/stdc++.h>
using namespace std;
const double EPS = (1e-10);
bool EQ(double a, double b) { return abs((a) - (b)) < EPS; }
void fast_stream() { std::ios_base::sync_with_stdio(0); }
long long cnts[1001];
int main() {
  string s;
  cin >> s;
  for (int i = 0; i < s.size(); i++) cnts[s[i]]++;
  long long sum = 0;
  for (int i = 0; i < 1001; i++) sum += cnts[i] * cnts[i];
  cout << sum << endl;
  return 0;
}
