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 Java (OpenJDK 11.0.6) (judge verdict: Runtime Error)

/**
 * 
 */
package One_out_of_Three;
  
import java.util.Scanner;

public class Main {


	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
      
		Scanner scanner = new Scanner(System.in);
		int A = scanner.nextInt();
    	int B = scanner.nextInt();
    	int C = scanner.nextInt();
		if(A==B){
			System.out.println(C);
	    }
    	if(B==C){
    		System.out.println(A);
    	}
		if(A==C){
    		System.out.println(B);
    	}
		
      
      
	}

}