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) {
			do {
				H = sc.nextInt();
				W = sc.nextInt();
			} while (H >= 300 && W >= 300);

			if (H == 0 && W == 0) {
				break;
			}
			for (int j = 0; j < H; j++) {
				for (int i = 0; i < W; i++){
					System.out.print("#");
				}
				System.out.print("\n");
			}

			System.out.print("\n");
		}
	}

}
/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