/* 	author:   		Chris O'Neill
   	date:     		Aug 2000
   	comments: 	String Comparison
*/



import java.io.*;
import java.lang.*;
import java.util.*;

class Comp
{
public static void main(String args[] )
	{
	String filein1 = args[0];
	String filein2 = args[1];
	String fileout = args[2];

	try
		{
		FileReader fr1 = new FileReader(filein1);
		BufferedReader br1 = new BufferedReader(fr1);

		FileReader fr2 = new FileReader(filein2);
		BufferedReader br2 = new BufferedReader(fr2);

		FileWriter fw = new FileWriter(fileout);
		BufferedWriter bw = new BufferedWriter(fw);

		String line1 = br1.readLine();
		String line2 = br2.readLine();

		while (line1 != null)
			{
			if (!line1.equals(line2))
				{
				bw.write(line1);
				bw.newLine();
				bw.write(line2);
				bw.newLine();
 				}
			line1 = br1.readLine();
			line2 = br2.readLine();
			}
		bw.close();
		}
	catch(Exception e)
		{
		System.err.println("File Error "+e);
		System.exit(0);
		}
	}//main
}//class