#P470E. Chessboard

Chessboard

No submission language available for this problem.

Description

Chessboard is a board of n × n squares arranged in two alternating colors (black and white). Top left square is white. You are given board size n. Output an image of a chessboard, with black and white squares marked with '#' and '.' characters, respectively.

The only line of input contains an integer n (1 ≤ n ≤ 9).

Output an image of n × n chessboard.

Input

The only line of input contains an integer n (1 ≤ n ≤ 9).

Output

Output an image of n × n chessboard.

Samples

4

.#.#
#.#.
.#.#
#.#.