Problem

Given the original message and the new message determine how many new letters will need to be purchased to create the new sign.

Input

The first line of input will contain a sequence of characters $($uppercase letters and spaces$)$ denoting the original message of the sign. The second line of input will contain a sequence of characters $($uppercase letters and spaces$)$ denoting the desired resulting message of the sign.

You are guaranteed that each message will have at most $100,000$ characters before the end of line characters.