The following languages are only available languages for the problems from the contest

Surprise Language Round #7:

- FALSE

Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

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E. Chessboard

time limit per test

2 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputChessboard 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.

Input

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

Output

Output an image of *n* × *n* chessboard.

Examples

Input

4

Output

.#.#

#.#.

.#.#

#.#.

Codeforces (c) Copyright 2010-2020 Mike Mirzayanov

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