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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
upper = [chr(x) for x in range(65, 91)]
lower = [chr(x) for x in range(97, 123)]

ans = 0
for x in input():
    if (x in upper):
        ans += ord(x) - 64
    elif (x in lower):
        ans -= ord(x) - 96
print(ans)