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 Go (1.6) (judge verdict: Wrong Answer)

package main

import (
	"fmt"
	"strconv"
)

func main() {
	var a, b string
	fmt.Scanln(&a)
	fmt.Scanln(&b)

	na, _ := strconv.ParseInt(a, 10, 0)
	nb, _ := strconv.ParseInt(a, 10, 0)
	fmt.Print(run(na, nb))
}

func run(na, nb int64) int {
	arr := []int{1, 2, 3}
	arr[na-1] = 0
	arr[nb-1] = 0
	for _, elem := range arr {
		if elem > 0 {
			return elem
		}
	}
	return 0
}