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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
c=0
for i in input():
    if 96<ord(i)<123:
        c-=ord(i)-96
    elif 64<ord(i)<91:
        c+=ord(i)-64
print(c)