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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;
string s;
int ans;
int ind(char c) {
  if (c >= 'a')
    return c - 'a' + 1;
  else
    return c - 'A' + 1;
}
int main() {
  ans = 0;
  cin >> s;
  for (int i = 0; i < (int)s.length(); ++i) {
    ans += (('@' < s[i]) && ('[' > s[i])) * (ind(s[i])) -
           (ind(s[i])) * (('`' < s[i]) && ('{' > s[i]));
  }
  cout << ans << endl;
  return 0;
}
