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 v5.12) (judge verdict: Wrong Answer)

"use strict";
// import bigInt from 'big-integer'

const Main = input => {
  const wrongAnswers = input.trim().split("\n");
  const answer = ["1", "2", "3"].filter(num => !wrongAnswers.some(wa => wa === num));
  console.log(answer);
};

Main(require("fs").readFileSync("/dev/stdin", "utf8"));