import java.util.*;
 
class Main {
    public static void main(String[] arg){
        Scanner in = new Scanner(System.in);
        while(true){
            int x = in.nextInt();   
            int y = in.nextInt();
            if (x == 0 && y == 0)break;
            StringBuilder sb = new StringBuilder();
            for(int i = 0;i < x;i++){
                for(int j=0;j < y;j++){
                    sb.append("#");
                }
                sb.append("\n");
            }
            System.out.println(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