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 JavaScript (Node.js 12.16.1) (judge verdict: Wrong Answer)

const readline = require('readline').createInterface({
	  input: process.stdin,
	  output: process.stdout
})

readline.question('Insert A ', (input1) => {
	readline.question('Insert B ', (input2) => {
		console.log(6-Number(input1)-Number(input2))
		readline.close()
	});
});