#include <bits/stdc++.h>
using namespace std;
long long int n;
char s[100008];
long long int i, a[1000], b[100];
long long int sum;
int main() {
  cin >> s;
  n = strlen(s);
  for (i = 0; i < n; i++)
    if (s[i] >= 'a' && s[i] <= 'z') a[s[i] - 'a']++;
  for (i = 0; i < n; i++)
    if (s[i] >= '0' && s[i] <= '9') b[s[i] - '0']++;
  for (i = 0; i < 26; i++)
    if (a[i] > 0) sum += a[i] * a[i];
  for (i = 0; i < 26; i++)
    if (b[i] > 0) sum += b[i] * b[i];
  cout << sum << endl;
  return 0;
}
