Score: 100 points
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.
Input is given from Standard Input in the following format:
A B
Print the correct choice.
3 1
2
When we know 3 and 1 are both wrong, the correct choice is 2.
1 2
3