лиса

#include <iostream>
#include <fstream>
#include <cmath>
#include <math.h>


using namespace std;

int n;
int m;

int main()
{
	cin >> n >> m;
	int k = n;
	while (true){
		for (int j = 1; j <= m; j++){
			cout << "#";
		}
		k = k - 1;
		if (k > 0){

		}
		else{
			cout << endl;
			return 0;
		}
		cout << endl;
		for (int j = 1; j <= m - 1; j++){
			cout << ".";
		}
		cout << "#";
		k = k - 1;
		if (k > 0){

		}
		else{
			cout << endl;
			return 0;
		}
		cout << endl;
		for (int j = 1; j <= m; j++){
			cout << "#";
		}
		k = k - 1;
		if (k > 0){

		}
		else{
			cout << endl;
			return 0;
		}
		cout << endl;
		cout << "#";
		for (int j = 1; j <= m - 1; j++){
			cout << ".";
		}
		k = k - 1;
		if (k > 0){

		}
		else{
			cout << endl;
			return 0;
		}
		cout << endl;
	}
}