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 Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)

package atcoder;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String A = scan.next();
		String B = scan.next();
		String answer = null;

		if(A.equals("1")) {
			if(B.equals("2")) {
				answer = "3";
			} else {
				answer = "2";
			}
		} else if (A.equals("2")) {
			if (B.equals("1")) {
				answer = "3";
			} else {
				answer = "1";
			}
		} else if (B.equals("1")){
			answer = "2";
		} else {
			answer = "1";
		}
		System.out.println("answer");
	}
}