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

main (){
  string chicken ("chicken");
  string egg ("egg");
  cout << "Before the swap, chicken comes from " << chicken;
  cout << " and egg comes from " << egg << endl;

  chicken.swap (egg);
  cout << "After the swap, chicken comes from " << chicken;
  cout << " and egg comes from " << egg << endl;
}