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));
		StringBuilder sb = new StringBuilder();

		String[] strArray = new String[2];
		int a, b;

		while(true) {
	        strArray = br.readLine().split(" ");
	        a = Integer.parseInt(strArray[0]);
	        b = Integer.parseInt(strArray[1]);

	        if(a == 0 && b == 0) {
	        	break;
	        }

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