import java.util.Scanner;

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

		String data [] = new String [1000];
		int i = 0;
		int Schranke;
		Scanner konsole = new Scanner(System.in);

		Schranke = konsole.nextInt();

	    while(konsole.hasNext()){
			data[i] = konsole.nextLine();
			i++;
		}


		System.out.println(Schranke);

		for (int j = 0; j < i ;j++){
			if (data[j].length() <= Schranke){
				System.out.println(data[j]);
			}
			else{
				data[j] = data[j+1];
				i = i - 1;
			}
		}
		konsole.close();
	}
}