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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>
#pragma comment(linker, "/STACK:100000000000,100000000000")
const int INF = 1e9;
const long double cp = 2 * asin(1.0);
const long double eps = 1e-9;
const long long mod = 1000000007;
using namespace std;
int main() {
  cin.tie(0);
  ios_base::sync_with_stdio(0);
  string s;
  cin >> s;
  int k = 0, p = 0;
  for (int(i) = 0; (i) < (s.size()); i++) {
    if (s[i] >= 'A' && s[i] <= 'Z') k += s[i] - 'A' + 1;
    if (s[i] >= 'a' && s[i] <= 'z') p += s[i] - 'a' + 1;
  }
  cout << k - p;
  return 0;
}
