Why is the output not what I want it to be

Question

#include <iostream>
#include <string>

using namespace std;

int main()
{
    string subject;
    cout << "What is your favourite subject";
    cin >> subject;
    cout << "Nice",subject, "is a good subject";
    return 0;
}

output

What is your favourite subject? input maths

output Nice

Answer 1

#include <iostream>
#include <string>

using namespace std;

int main()
{
    string subject;
    cout << "What is your favourite subject";
    cin >> subject;
    cout << "Nice " << subject << " is a good subject";
    return 0;
}