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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
xs = input().strip()

r = 0

for x in xs:
    n = ord(x.lower()) - ord('a') + 1
    b1 = b2 = b3 = b4 = 0
    if '@' < x:
        b1 = 1
    if '[' > x:
        b2 = 1
    if '`' < x:
        b3 = 1
    if '{' > x:
        b4 = 1
    r += n * (b1 and b2) - n * (b3 and b4)

print(r)
