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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, qwq, qaq, len;
int main() {
  cin >> s;
  len = s.length();
  for (int i = 0; i < len; i++) {
    qwq = 0, qaq = 0;
    if (s[i] > '@' && s[i] < '[') qwq = s[i] - 'A' + 1;
    if (s[i] > '`' && s[i] < '{') qaq = s[i] - 'a' + 1;
    ans += qwq - qaq;
  }
  cout << ans;
}
