Problem Statement

You are given an integer $N$ that has exactly four digits in base ten. How many times does 2 occur in the base-ten representation of $N$?

Constraints

• $1000 \\leq N \\leq 9999$

Input

Input is given from Standard Input in the following format:

$N$

Output

Print the answer.

Sample Input 1

1222

Sample Output 1

3

2 occurs three times in 1222. By the way, this contest is held on December $22$ (JST).

Sample Input 2

3456

Sample Output 2

0

Sample Input 3

9592

Sample Output 3

1