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 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <stdlib.h>

int main()
{
	char *s;
	char *t;
	int n;
	
	scanf("%d", &n);
	
	s = (char *)malloc(sizeof(char) * n);
	t = (char *)malloc(sizeof(char) * n);
	
	scanf("%s", s);
	scanf("%s", t);
	
	for(int i = 0; i < n; i++){
		printf("%c%c", s[i], t[i]);
	}
	//printf("\n");
		
	
	free(s);
	free(t);
	
	return 0;
}