What will be the output of the following C++ code?

#include <iostream>  
#include <utility>
#include <string>
 
using namespace std;
 
int main () 
{
  pair <int,int> p1(1,2);
  pair <int,int> p2(3,4);
  cout<<"Pair(first,second) = ("<<p1.first<<","<<p1.second<<")\n";
  p1.swap(p2);
  cout<<"Pair(first,second) = ("<<p1.first<<","<<p1.second<<")\n";
  return 0;
}