2. Sequences of Equal Strings

import java.util.Scanner;


public class _02_SequencesOfEqualStrings {

    public static void main(String[] args) {
        Scanner sc = new Scanner (System.in);
        String[] words = sc.nextLine().split(" ");

        for (int i = 0; i < words.length - 1; i++) {
            System.out.print(words[i] + " ");
            if (! words[i].equals(words[i+1]))
                System.out.println();
        }
        System.out.print(words[words.length - 1]);

    }

}