import java.util.Scanner;



public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a,b;
		for(;;){
			a=sc.nextInt();
			b=sc.nextInt();
			if(a==0&&b==0)break;
			else{for(int i=0;i<a;i++){
				for(int l = 0;l<b;l++){
					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