import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int H;
		int W;

		while (true) {
			H = sc.nextInt();
			W = sc.nextInt();

			if (H == 0 && W == 0)
				break;

			printRectangle(H, W);

		}

	}

	public static void printRectangle(int H, int W) {
		for (int i = 0; i < H; i++) {
			for (int j = 0; j < W; j++) {
				System.out.print("#");

				if (j == (W - 1))
					System.out.println("");
			}
		}
		System.out.println();
	}

}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz