#include <map>
#include <iostream>
#include <string>
#include <vector>

using LL = long long;

using namespace std;

int main() {
  ios_base::sync_with_stdio(false);
  string s;
  cin >> s;
  map<char, LL> cnt;
  for (char c : s)
    cnt[c]++;

  LL res = 0;
  for (char c = 'a'; c <= 'z'; ++c) {
    for (char c2 = 'a'; c2 <= 'z'; ++c2) {
      res += abs(LL(c) - LL(c2)) * cnt[c] * cnt[c2];
    }
  }

  res /= 2;
  cout << res * s.size() << endl;
}