/************************************************************************** 
 swap.cc
 author: Nandor Sieben 
 input: lines containing an integer and a double separated by whitespaces
 output: same lines, numbers reversed, separated by a tab

 stops at first empty line
***************************************************************************/

#include <iostream>

using namespace std;


main (void)
{
  int x;			// first number in the line
  double y;			// second number in the line 
  while (cin >> x) {		// read lines while not an empty line
    cin >> y;			// read second number 
    cout << y << "\t" << x << "\n";	// print them reversed
  }
}