import java.util.Scanner;
import java.util.Arrays;

class Main{
	public static void main(String[] args){
		Scanner scanner = new Scanner(System.in);
		StringBuilder sb = new StringBuilder();
		
		while(true){
			int h = scanner.nextInt();
			int w = scanner.nextInt();
			
			if(h == 0 && w == 0){
				break;
			}

			for(int i = 0; i < h; i++){
				for(int j = 0; j < w; j++){
					sb.append("#");
				}
				sb.append("\n");
			}
			sb.append("\n");
		}
		System.out.print(sb);
	}
}
/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