public class taskOne{
	public static void main(String args[]){

		int previous = Integer.parseInt(args[0]);

			System.out.print(previous + " ");

		for(int i = 1 ; i < args.length ; i++){
			int next = Integer.parseInt(args[i]);

			if(next != previous){
				previous = next;
				System.out.print(previous + " ");
			}

		}



	}

}