#include <iostream>
using namespace std;

int main(int argc,char *argv[]){
	int H,W;
	while(1) {
		cin >> H >> W;
		if (H == 0 && W == 0) break;
		for(int i = 0; i < H; i++){
			for (int j = 0; j < W; j++){
				cout << "#";
			}
			cout << "\n";
		}
		cout << "\n";
	}
	return 0;
}
