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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:102400000,102400000")
template <class T>
inline void gmax(T &a, T b) {
  if (b > a) a = b;
}
template <class T>
inline void gmin(T &a, T b) {
  if (b < a) a = b;
}
using namespace std;
const int N = 1e5 + 10, M = 2e6 + 10, Z = 1e9 + 7, maxint = 2147483647,
          ms1 = 16843009, ms31 = 522133279, ms63 = 1061109567,
          ms127 = 2139062143;
const double PI = acos(-1.0), eps = 1e-8;
void fre() {
  freopen("/Users/luras/Desktop/in.txt", "r", stdin);
  freopen("/Users/luras/Desktop/out.txt", "w", stdout);
}
const int INF = 1e9;
int casenum, casei;
int ans, len;
char s[100];
int main() {
  while (~scanf("%s", s)) {
    len = strlen(s);
    ans = 0;
    for (int i = 0; i < len; i++) {
      if (s[i] >= 'a' && s[i] <= 'z') ans -= s[i] - 'a' + 1;
      if (s[i] >= 'A' && s[i] <= 'Z') ans += s[i] - 'A' + 1;
    }
    printf("%d\n", ans);
  }
  return 0;
}
