import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (true) {
            int[] a = new int[]{sc.nextInt(), sc.nextInt()};
            if (a[0] == 0 && a[1] == 0) {
                break;
            }
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < a[0]; i++) {
                for (int j = 0; j < a[1]; j++) {
                    sb.append("#");
                }
                sb.append("\n");
            }
            System.out.println(sb.toString());
        }
    }
}
/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