<image>

You can preview the image in better quality by the link: [http://assets.codeforces.com/files/656/without-text.png](//assets.codeforces.com/files/656/without-text.png)

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 f(char c) {
  bool cte1 = '@' < c;
  bool cte2 = '[' > c;
  bool cte3 = '`' < c;
  bool cte4 = '{' > c;
  int cte12 = cte1 && cte2;
  int cte34 = cte3 && cte4;
  int alphaIdx;
  if ('a' <= c && c <= 'z') {
    alphaIdx = c - 'a' + 1;
  } else if ('A' <= c && c <= 'Z') {
    alphaIdx = c - 'A' + 1;
  } else {
    return 0;
  }
  return cte12 * alphaIdx - cte34 * alphaIdx;
}
int main() {
  string s;
  getline(cin, s);
  int result = 0;
  for (char c : s) {
    result += f(c);
  }
  cout << result << endl;
}
