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;
			StringBuilder shp=new StringBuilder();
			
			for (int i=0;i<h;i++){
				for (int j=0;j<w;j++){
					shp.append("#");
				}
				shp.append("\n");
			}//for 
			System.out.println(shp);
		}//while
	}
}
/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