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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()

alpha = "abcdefghijklmnopqrstuvwxyz.0123456789"

res = 0
for c in s:
    x1 = int('@' < c and '[' > c)
    x2 = alpha.index(c.lower()) + 1
    x3 = int('`' < c and '{' > c)
    x4 = x1 * x2
    x5 = x2 * x3
    x6 = x4 - x5
    res += x6
    
print(res)
    
