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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;
inline int ri() {
  int x = 0, f = 1, c = getchar();
  for (; c < 48 || c > 57; f = c == '-' ? -1 : f, c = getchar())
    ;
  for (; c > 47 && c < 58; x = x * 10 + c - 48, c = getchar())
    ;
  return x * f;
}
string s;
int main() {
  cin >> s;
  int sum = 0;
  for (int i = 0; i < (int)s.size(); ++i) {
    char c = s[i];
    if ((c >= 'A') && (c <= 'Z')) {
      sum += c - '@';
    }
    if ((c >= 'a') && (c <= 'z')) {
      sum -= c - '`';
    }
  }
  cout << sum << endl;
  return 0;
}
