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 Rust (1.15.1) (judge verdict: Accepted)

fn main() {
    let a = read::<usize>();
    let b = read::<usize>();

    let ret: usize;
    if a == 1 && b == 2 {
        ret = 3;
    } else if a == 1 && b == 3 {
        ret = 2;
    } else if a == 2 && b == 1 {
        ret = 3;
    } else if a == 2 && b == 3 {
        ret = 1;
    } else if a == 3 && b == 1 {
        ret = 2;
    } else {
        ret = 1;
    }

    println!("{}", ret);
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).unwrap();
    s.trim().parse().ok().unwrap()
}