Your friend and you made a list of topics and both of them voted if they like or dislike the topic. They wrote 0 to denote dislike and 1 to denote like. They asked you to count the number of topics that both like or both dislike.

Input format

• The first line contains a string, $A$, denoting Bob's likes and dislikes.
• The second line contains a string, $P$, denoting Alice's likes and dislikes.

Output format

Print the number of topics both, Bob and Alice, like or dislike.

Constraints

$1 \le |A|, |P| \le 10^5$
$|A| = |P|$

• Both A and P contains only 0 and 1. 0 denotes dislike and 1 denotes like.