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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 inx(char c) {
  if (c < 'a') {
    return (c - 'A' + 1);
  } else {
    return (c - 'a' + 1);
  }
}
int operate(char c) {
  bool at = '@' < c;
  bool brc = '[' > c;
  bool btc = '`' < c;
  bool cbr = '{' > c;
  bool up = at & brc;
  bool dn = btc & cbr;
  int iup = up * inx(c);
  int idn = dn * inx(c);
  return (iup - idn);
}
int main() {
  string s;
  cin >> s;
  int ans = 0;
  for (int i = 0; i < s.size(); i++) {
    ans += operate(s[i]);
  }
  cout << ans << endl;
}
