using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SequencesOfStrings_4
{
    class SequencesOfStrings_4
    {
        static void Main(string[] args)
        {
            string[] input = Console.ReadLine().Split();

            for (int i = 0; i < input.Length - 1; i++)
            {
                Console.Write(input[i]+" ");
                if (!input[i].Equals(input[i + 1]))
                {
                    Console.WriteLine();
                }
            }
            Console.Write(input[input.Length-1]);
            Console.WriteLine();
        }
    }
}