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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;
pair<pair<int, int>, int> pii[123456];
int main() {
  int p1 = '@', p2 = '[', p3 = '`', p4 = '{';
  string s;
  cin >> s;
  int len = s.length();
  int res = 0;
  for (int i = 0; i < len; i++) {
    if (!isalpha(s[i])) continue;
    int ind = tolower(s[i]) - 'a' + 1;
    int k1 = 0, k2 = 0;
    if (p1 < s[i] && p2 > s[i]) k1 = ind;
    if (p3 < s[i] && p4 > s[i]) k2 = ind;
    res += k1 - k2;
  }
  cout << res << endl;
  return 0;
}
