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)

'use strict'

function main(s) {

  s = s.split('\n')[0].split(' ');
  let ans = '';
  
  if (s[0] !== s[1] && s[1] === s[2]) ans = s[0];
  if (s[0] !== s[1] && s[1] !== s[2]) ans = s[1];
  if (s[0] === s[1] && s[1] !== s[2]) ans = s[2];

  console.log(ans);
}

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