// Latihan bergaya OSN, Bab 02, soal 1 -- pembahasan.
//
// Papan catur 8x8. Tanpa perulangan: delapan baris ditulis satu per satu.
// Baris ganjil dimulai '#', baris genap dimulai '.'.

#include <iostream>
using namespace std;

int main() {
    cout << "#.#.#.#.\n";
    cout << ".#.#.#.#\n";
    cout << "#.#.#.#.\n";
    cout << ".#.#.#.#\n";
    cout << "#.#.#.#.\n";
    cout << ".#.#.#.#\n";
    cout << "#.#.#.#.\n";
    cout << ".#.#.#.#\n";
    return 0;
}