<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;
inline int Readint() {
  int ret = 0;
  int f = 1;
  char ch;
  do {
    ch = getchar();
    if (ch == '-') f *= -1;
  } while (ch >= 0 && (ch < '0' || ch > '9'));
  while ('0' <= ch && ch <= '9') {
    ret = ret * 10 + ch - '0';
    ch = getchar();
  }
  return ret * f;
}
void open() {
  freopen("*.in", "r", stdin);
  freopen("*.out", "w", stdout);
}
void close() {
  fclose(stdin);
  fclose(stdout);
}
int main() {
  int _ = 0;
  string a;
  int sum = 0;
  cin >> a;
  for (int i = 0, _END_ = a.length() - 1; i <= _END_; i++) {
    if (a[i] >= 'A' && a[i] <= 'Z') sum += a[i] - '@';
    if (a[i] >= 'a' && a[i] <= 'z') sum -= a[i] - '`';
  }
  printf("%d\n", sum);
  close();
  return 0;
}
