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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.*;
import java.io.*;

class Main {

	void solve() {
		
		int a = inint(), b = inint(), c = inint();
		
		if (a == b) out.println(c);
		else if (a == c) out.println(b);
		else out.println(a);
		
	}

	public static Scanner in = new Scanner(System.in);
	public static PrintWriter out = new PrintWriter(System.out);

	public static void main(String[] args) {
		new Main().solve();
		out.flush();
	}

	public int inint() {
		return in.nextInt();
	}

	public long inlong() {
		return in.nextLong();
	}
	
	public String instr() {
		return in.next();
	}

	public char inchar() {
		return in.next().charAt(0);
	}
	
	public int[] inintar(int num) {
		int[] a = new int[num];
		for (int i=0; i<num; i++) {
			a[i] = in.nextInt();
		}
		return a;
	}

	public char[] incharar() {
		return in.next().toCharArray();
	}

}