/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class O
{
 
	 protected String X;
 
	 public O(String x) {
	 	this.X = x;
	 }
	 public void swap(O otherO) {
	 	System.out.println(this.X+" "+otherO.X+"\n");
 
	    String otherOX = otherO.X;
	    otherO.X = this.X;
	    this.X = otherOX;
 
	    System.out.println(this.X+' '+otherO.X);
	  }
 
	public static void main (String[] args) throws java.lang.Exception
	{
 
		O L = new O("2");
		O R = new O("10");
 
		L.swap(R);
 
	}
}

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