import java.util.Random;
import java.util.Scanner;
public class main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		String str = "abcdefghijklmnopqrstuvwxyz";
		Random r = new Random();
		String l = "";
		for (int i=0; i<n; i++) {
			StringBuffer sb = new StringBuffer();
			for (int j=0; j<10; j++) {
				int val = r.nextInt(str.length());
				sb.append(str.charAt(val));
			}
			if (sb.substring(sb.length()-1, sb.length()) == "n") {
				sb = sb.delete(sb.length()-1, sb.length());
			}
			if (i==n-1)
				System.out.println(l + sb + "n");
			else {
				System.out.println(l + sb);
				l = sb.substring(sb.length()-1, sb.length());
			}
		}
		
	}
}