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 C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;

using System.Collections.Generic;
public class a{
 static void Main(){
  int a = int.Parse(Console.ReadLine());
  int b = int.Parse(Console.ReadLine());
  List<int> abc = new List<int>(){1,2,3};
  abc.Remove(a);
  abc.Remove(b);
   Console.WriteLine(abc[0]);
 }
}