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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 = raw_input().replace('\n','')
res = 0

for c in s:
    a1 = '@' < c
    a2 = '[' > c
    a3 = '`' < c
    a4 = '{' > c
    b1 = int(a1 and a2)
    b2 = ord(c.lower())-ord('a')+1
    b3 = int(a3 and a4)
    c1 = b1 * b2
    c2 = b2 * b3
    d1 = c1 - c2
    res += d1

print res