import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		while (true) {
			int H = sc.nextInt();
			int W = sc.nextInt();
			if (H == 0 && W == 0) {
				break;
			}
			for (int i = 1; i <= H; i++) {
				for (int j = 1; j <= W; j++) {
					System.out.print("#");
				}
				System.out.print("\n");
			}
			System.out.print("\n");
		}
	}
}