Problem:
Score: 100 points

Problem Statement

Takahashi is solving quizzes. He has easily solved all but the last one.

The last quiz has three choices: 1, 2, and 3.

With his supernatural power, Takahashi has found out that the choices A and B are both wrong.

Print the correct choice for this problem.

Constraints

Each of the numbers A and B is 1, 2, or 3.

A and B are different.

Input

Input is given from Standard Input in the following format:

A
B

Output

Print the correct choice.

Sample Input 1

3
1

Sample Output 1

2

When we know 3 and 1 are both wrong, the correct choice is 2.

Sample Input 2

1
2

Sample Output 2

3

Solution in Java (OpenJDK 1.8.0) (judge verdict: Runtime Error)


import java.util.Scanner;

class Main {
	public static void main(String args[]){
    Scanner scan = new Scanner(System.in);

    int n = scan.nextInt();
    String s = scan.next();
    String t = scan.next();
    StringBuilder sb =new StringBuilder();

    for(int i=0 ; i < n ; i++) {
    sb.append(s.charAt(i));
    sb.append(t.charAt(i));
    }
    System.out.println(sb.toString());
	}
}