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)

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

int main(void) {
	char s[105], t[105], output[210];
	int i, n, s_num=0, t_num=0;
	
	scanf("%d", &n);
	scanf("%s", s);
	scanf("%s", t);

	for (i = 0; i < 2*n; i++) {
		if (i % 2 == 0) {
			output[i] = s[s_num];
			s_num++;

		}
		else {
			output[i] = t[t_num];
			t_num++;
		}
	}
	
	output[2 * n] = '\0';

	printf("%s", output);

	return 0;
}