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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;
void read(int &digit) {
  digit = 0;
  char c;
  for (c = getchar(); (c < '0' || c > '9') && c != '-'; c = getchar())
    ;
  bool type = false;
  if (c == '-') type = true, c = getchar();
  for (; c >= '0' && c <= '9'; digit = digit * 10 + c - '0', c = getchar())
    ;
  if (type == true) digit = -digit;
}
char s[1010];
int main() {
  scanf("%s", s + 1);
  int n = strlen(s + 1);
  int mjy = 0;
  for (int i = 1; i <= n; i++) {
    if (s[i] <= 'Z' && s[i] >= 'A') mjy += s[i] - 'A' + 1;
    if (s[i] <= 'z' && s[i] >= 'a') mjy -= s[i] - 'a' + 1;
  }
  printf("%d\n", mjy);
  return 0;
}
