#include <iostream>
using namespace std;
int main(){
	int a , b;
	while(1){
		cin>> a >> b;
		if(a==0)break;
		for (int i = 0; i < a ; i++){
			for (int j = 0; j < b; j++){
				cout << "#" ;
			}
			cout << endl;
		}
		cout << endl;
	}
}
