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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()
res = 0
for i in s:
    if i.islower():
        res -= ord(i) - ord("a") + 1
    elif i.isupper():
        res += ord(i) - ord("A") + 1
print(res)
