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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
s = input()
ans = 0
for i in s:
    if (i >= 'A') and (i <= 'Z'):
        ans += ord(i) - ord('A') + 1
    elif (i >= 'a') and (i <= 'z'):
        ans -= ord(i) - ord('a') + 1
print(ans)