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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 x in s:
    f1 = ('@' < x)
    f2 = (']' > x)
    g1 = ("`" < x)
    g2 = ("{" > x)
    f = int(f1 and f2)
    g = int(g1 and g2)
    res += (ord(x.lower()) - ord('a') + 1) * (f - g)

print(res)