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 Python (3.8.2) (judge verdict: Accepted)

def main():
    a = int(input())
    b = int(input())
    if a == 1 and b == 2 or a == 2 and b == 1:
        print(3)
    elif a == 2 and b == 3 or a == 3 and b == 2:
        print(1)
    elif a == 3 and b == 1 or a == 1 and b == 3:
        print(2)
         
if __name__ == '__main__':
    main()