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: Accepted)

"use strict";
const Main = (input) =>{
   let xs = input.trim().split('\n');
   const compare = (a, b)=>{ 
   return a - b;  
   }
   xs.sort(compare);
   if(xs[0]==1 && xs[1]==2){
   console.log(3);
   }else if(xs[0]==2 && xs[1]==3){
   console.log(1);
   }else{
   console.log(2);
   }
}
Main(require('fs').readFileSync('/dev/stdin','utf8'));