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 JavaScript (node.js v5.12) (judge verdict: Accepted)

function main(input) {
  input=input.trim();
  const a = parseInt(input.split(" ")[0], 10);
  const b = parseInt(input.split(" ")[1], 10);
  const c = parseInt(input.split(" ")[2], 10);
  if(a!=b&&a!=c){
    console.log(a);
  }else if(b!=a&&b!=c){
    console.log(b);
  }else{
    console.log(c);
  }
  
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'));