import java.io.*;

class Main{

    public static void main(String[] args)throws IOException{

	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

	while(true){
	    String input = br.readLine();
	    String[] div = input.split(" ");
	    int height = Integer.parseInt(div[0]);
	    int width = Integer.parseInt(div[1]);

	    if(height == 0 && width == 0){
		break;
	    }
	    
	    for(int i = 0; i < height; i++){
		for(int j = 0; j < width; j++){
		    System.out.printf("#");
		}
		System.out.printf("\n");
	    }
	    System.out.printf("\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