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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(void) {
  string s;
  char c;
  cin >> s;
  int a = 0;
  for (int i = 0, c = s[0]; i < s.size(); c = s[++i]) {
    bool x = ('@' < c) && (c < '[');
    bool y = ('`' < c) && (c < '{');
    int tmp = (c >= 'a' && c <= 'z')
                  ? c - 'a' + 1
                  : ((c >= 'A' && c <= 'Z') ? c - 'A' + 1 : 0);
    a += (x ? tmp : 0) - (y ? tmp : 0);
  }
  cout << a << endl;
  return 0;
}
