import java.util.Scanner;


public class SequenceOfEqualStrings02 {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		String[] input = in.nextLine().split(" ");
		System.out.print(input[0]);
		for (int i = 1; i < input.length; i++) {
		    if(input[i].equals(input[i-1])){
		    	System.out.print(" " + input[i]);
		    }
		    else{
		    	System.out.println();
		    	System.out.print(input[i]);
		    }
		}

	}

}