import java.util.Scanner;

class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        do {
            int h = sc.nextInt();
            int l = sc.nextInt();

            if (h == 0 && l == 0) {
                break;
            } else {

                for (int i = 0; i < h; i++) {
                    for (int j = 0; j < l; j++) {
                        System.out.print('#');
                    }
                    System.out.println();
                }

                System.out.println();
            }

        } while (true);
    }

}
/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