import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args)throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int a = 0;
		int b = 0;

		while(true){
			String str = br.readLine();
			String[] s = str.split(" ");

			a = Integer.parseInt(s[0]);
			b = Integer.parseInt(s[1]);
			if((a <= 300) &&(b <= 300)){
				if((a == 0)&&(b == 0)){
					break;
				}

				for(int i = 0; i < a; i++){
					for(int j = 0; j < b; j++){
						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