What goes for cin here?

[ComputerNub5]

#include <iostream>
#include <string>
using namespace std;

int main()
{
cout << "\tMike's Login\n";
int security = 0;

string username;
cout << "\nUsername: ";
cin >> username;

string password;
cout << "Password: ";
cin >> password;


if (username == "Mike" && password == "password")
{
cout << "\nWelcome Mike, Please Select a Choice Below";
cout << "\n1-Choice1";
cout << "\n2-Choice2";
cout << "\n3-Choice3";
cin >> ????????

}

if (!security)
cout << "\nYour login failed.";

return 0;
}