/* http://es.stackoverflow.com/q/42298/127 */
 
 
import java.util.*;
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
	{
		final String regex = "\\b(\\w+)(?> +\\1)+\\b";
        final Pattern p = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
 
        final String reemplazo = "$1";
 
        Scanner in = new Scanner(System.in);
        String input = in.nextLine();
        Matcher m = p.matcher(input);
 
        //Se reemplazan todas las ocurrencias
        input = m.replaceAll(reemplazo);
 
        System.out.println(input);
	}
}

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