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++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include "stdio.h"
#include "stdlib.h"

int main(){

int n;

scanf("%d",&n);

char s[100];
char t[100];

scanf("%s %s",s,t);

char buf[n*2];

for(int i=0;i<n;i++){
    buf[i*2]=s[i];
    buf[(i*2)+1]=t[i];
}

printf("%s",buf);
}