Problem:
Score : 100 points

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

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.*;
public class Main {
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		String N = sc.next();
		int cnt = 0;
		if(N.substring(0, 1).equals("2")) cnt++;
		if(N.substring(1, 2).equals("2")) cnt++;
		if(N.substring(2, 3).equals("2")) cnt++;
		if(N.substring(3, 4).equals("2")) cnt++;
		System.out.println(cnt);
	}
}