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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
__author__ = "runekri3"

ALPHABET_LOWER = "abcdefghijklmnopqrstuvwxyz"
ALPHABET_HIGHER = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

inp_str = input()
answer = 0

for letter in inp_str:
    if letter in ALPHABET_HIGHER:
        answer += ALPHABET_HIGHER.index(letter) + 1
    elif letter in ALPHABET_LOWER:
        answer -= (ALPHABET_LOWER.index(letter) + 1)

print(answer)
