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++14 (GCC 5.4.1) (judge verdict: Runtime Error)

#include <bits/stdc++.h>
using namespace std;

int main() {
  int H,W;
  cin >> H,W;
  
  vector<string> v(H);
  for(int i=0;i<H;i++){
    cin >> v.at(i);
  }
  
  for(int i=0;i<H;i++){
    for(int j=0;j<W;j++){
      if(v[i][j] == '.'){
        int cnt=0;
        for(int h=i-1;h<i+2;h++){
          for(int w=j-1;w<j+2;j++){
            if(w<0||h<0||h>=H||w>=W) continue;
            if(v[h][w]=='#') 
              cnt++;
          }
        }
        v[i][j] =static_cast<char> (cnt);
      }
    }
  }
  for(int i=0; i<H; i++){
    cout << v[i] << endl;
  }
}