import java.util.Scanner;

class Main {
	static void drawBox(int w, int h){
		for(int i = 0; i < h; i ++){
			for(int j = 0; j < w; j ++){
				System.out.print("#");
			}
			System.out.print("\n");
		}
		System.out.print("\n");
	}
	
    public static void main(String[] args){
    	Scanner in = new Scanner(System.in);
    	
    	while(in.hasNextLine()){
    		int h = in.nextInt(), w = in.nextInt();
    		int i = 0;
    		
    		if(w == 0 && h == 0){
    			break;
    		}else{
    			if(i != 0){
    				System.out.print("\n");
    			}
    			drawBox(w, h);
    			i ++;
    		}
       	}
    	
    	in.close();
	}
}
/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