import java.util.ArrayList;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO ?????????????????????????????????????????????


		Scanner scan = new Scanner(System.in);
		ArrayList<Integer[]> list = new ArrayList<Integer[]>();

		Integer[] ary;

		while(scan.hasNext()){

			ary = new Integer[2];
			//???H
			ary[0] = scan.nextInt();
			//?¨?W
			ary[1] = scan.nextInt();

			if(ary[0] != 0 && ary[1] != 0){

				list.add(ary);
			}else{
				scan.close();
				break;
			}

		}

		for(int i = 0; i < list.size(); i++){

			ary = list.get(i);
			//???
			for(int j = 0; j < ary[0]; j++){

				//?¨?
				for(int k = 0; k < ary[1]; k++){

					System.out.print("#");
				}
				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