Problem:
Score : 100 points

Problem Statement

You are given three integers, A, B and C.

Among them, two are the same, but the remaining one is different from the rest.

For example, when A=5,B=7,C=5, A and C are the same, but B is different.

Find the one that is different from the rest among the given three integers.

Constraints

-100 \leq A,B,C \leq 100

A, B and C are integers.

The input satisfies the condition in the statement.

Input

Input is given from Standard Input in the following format:

A B C

Output

Among A, B and C, print the integer that is different from the rest.

Sample Input 1

5 7 5

Sample Output 1

7

This is the same case as the one in the statement.

Sample Input 2

1 1 7

Sample Output 2

7

In this case, C is the one we seek.

Sample Input 3

-100 100 100

Sample Output 3

-100

Solution in Rust (1.15.1) (judge verdict: Accepted)

fn getline() -> String {
    let mut __ret = String::new();
    std::io::stdin().read_line(&mut __ret).ok();
    return __ret;
}

fn solve(a: i32, b: i32, c: i32) -> i32 {
    if a == b {
        return c;
    } else if a == c {
        return b;
    }

    return a;
}

fn main() {
    let s = getline();
    let vec: Vec<i32> = s.trim().split(' ').map(|s| s.parse().unwrap()).collect();
    let a = vec[0];
    let b = vec[1];
    let c = vec[2];

    let ans = solve(a, b, c);
    println!("{}", ans);
}