/* package whatever; // don't place package name! */
 
import java.io.*;
 
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String input = "The big black dog big black dog is a friendly friendly dog who lives nearby nearby.";
 
		Pattern dupPattern = Pattern.compile("([ \\w]+)\\1", Pattern.CASE_INSENSITIVE);
		Matcher matcher = dupPattern.matcher(input);
 
		while (matcher.find()) {
		    input = input.replaceAll("([ \\w]+)\\1", "$1");
		}
		System.out.println(input);
 
	}
}

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