#include<fstream>
#include<iostream>

using namespace std;

int main()
{ int n, a[1000], b[1000],i,j,k;
  ifstream fin("bac.txt");
  fin>>n;
  for(i=1;i<=n;i++) fin>>a[i]>>b[i];
  
  for(i=1;i<=n;i++)
    { k=0;
      for(j=1;j<=n;j++)
         if(i!=j) if(a[i]>b[j] || a[j]>b[i]) k++;
      if(k==n-1) cout<<a[i]<<" "<<b[i]<<endl;
    }
  fin.close();
  system("pause");  
  return 0;
}