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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
d = {chr(ord('a') + i): i + 1 for i in xrange(26)}
d.update({chr(ord('A') + i): i + 1 for i in xrange(26)})
def f(c):
    i = ord(c)
    return ((ord('@') < i and ord('[') > i) - (ord('`') < i and ord('{') > i)) * d.get(c, 0)
s = raw_input().strip()
print sum(map(f, s))