Help me in solving USR2V2 problem

My issue

there is output of the sum but its showing wrong answer???.

My code

#include <iostream>
using namespace std;

int main() {

  int a, b;
  int sum;
  int diff;
  cin >> a;
  cin >> b;
  sum = a +b;
  diff= a-b;
  cout<<"sum is: " <<  sum << endl;
  cout<< "Difference:  "<<diff;

  return 0;

Learning course: Learn C++
Problem Link: CodeChef: Practical coding for everyone

The s of sum should be in uppercase .