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 C (GCC 5.4.1) (judge verdict: Accepted)

#include<stdio.h>

int main(void)
{
    int a,b,c;
    scanf("%d%d%d",&a,&b,&c);
    while((a==b&&b==c)||!((a==b)||(b==c)||(a==c)))
    {
        scanf("%d%d%d",&a,&b,&c);
    }
    if(a==b)
    {
        printf("%d\n",c);
    }
    else if(b==c)
    {
        printf("%d\n",a);
    }
    else
    {
        printf("%d\n",b);
    }
    return 0;
}