#include <iostream>
using namespace std;

int main()
{

	int H, W;

	while( cin >> H >> W, H || W ) {

		for( int i = 0; i < H; i++ ) {
			for( int j = 0; j < W; j++ ) cout << "#";
			cout << endl;
		}

		cout << endl;

	}

	return 0;

}