What happens if characters 'w', 'o', 'r', 'l' and 'd' are entered as input?

What happens if characters 'w', 'o', 'r', 'l' and 'd' are entered as input?

#include

#include

using namespace std;

int main()

{

string s1 = "Hello";

string s2;

getline( cin, s2 );

cout << s1 + s2;

return( 0 );

}