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Input

The only line of the input is a string (between 1 and 50 characters long, inclusive). Each character will be an alphanumeric character or a full stop ".".

Output

Output the required answer.

Examples

Input

Codeforces


Output

-87


Input

APRIL.1st


Output

17
#include <bits/stdc++.h>
using namespace std;
const double EPS = 1e-9;
const int N = 17, MOD = 1000000007, P = 239017, P1 = 997;
int i, n, ans, ind;
string s;
int main() {
  ios_base::sync_with_stdio(0);
  cin >> s;
  n = s.size();
  for (i = 0; i < n; i++) {
    if (!isalpha(s[i])) continue;
    if ((int)s[i] >= 97) {
      ind = s[i] - 'a' + 1;
      ans -= ind;
    } else {
      ind = s[i] - 'A' + 1;
      ans += ind;
    }
  }
  cout << ans;
  return 0;
}
