<image>

You can preview the image in better quality by the link: [http://assets.codeforces.com/files/656/without-text.png](//assets.codeforces.com/files/656/without-text.png)

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
a=input()
sum = 0
for i in a:
    a0 = 0
    a1 = 0
    if ('@' < i) & ('[' > i):
        a0 = 1
    if ('`' < i) & ('{' > i):
        a1 = 1
    a0 = (a0 - a1)
    a1 = 0
    if ('a' <= i <= 'z'):
        a1 = (ord(i) - ord('a') + 1)
    if ('A' <= i <= 'Z'):
        a1 = (ord(i) - ord('A') + 1)
        
    sum +=  a0 * a1
print(sum)