You have been given a column title as appears in an Excel sheet, return its corresponding column number.

For example:

A -> 1
B -> 2
C -> 3
...
Z -> 26
AA -> 27
AB -> 28 
...

Input Format

The only line of input contains a string S i.e. column title 

Constraints:

1 <= |S| <= 10
Input contains only uppercase English Alphabet letters

Time Limit : 1 sec

Output Format

The only line of output will print the column number corresponding to given column title