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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;
int main() {
  string s;
  cin >> s;
  string before = s.substr(0, 1);
  string after = s.substr(s.length() - 1, 1);
  string middle = s.substr(1, s.length() - 2);
  int ans = 0;
  for (int i = 0; i < s.length(); i++) {
    int x = 0;
    if (s[i] > 96) x = s[i] - 96;
    if (s[i] < 91) x = s[i] - 64;
    int first = 0;
    if (s[i] > '@' && s[i] < '[') {
      first = x;
    }
    int second = 0;
    if (s[i] > '`' && s[i] < '{') {
      second = x;
    }
    ans += first - second;
  }
  cout << ans << "\n";
}
