Help me in solving LCPPCL59 problem

help
,
1

My issue

how to store sum of “a” and “b” to “sum”

My code

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

int main() {
    // Complete the code as per given instructions on the left
    int a, b;
    cin>>a,b;
    int sum;
     sum = a+b;
    int diff;
    diff =a-b;
     
    cout << "Sum is: " << sum << endl;
    cout << "Difference is: "<< diff << endl;
}

Learning course: ATT - C++
Problem Link: Calculator Practice Problem in ATT - C++ - CodeChef