#717. Pattern: Chessboard
You are given n. Print the **Chessboard** pattern of size n, like in the example. Be careful with spaces (spaces at the end of a line do not matter).
### Input
One integer n (2 ≤ n ≤ 9).
### Output
The pattern.
Examples
Input
3
Output
#.# .#. #.#
Input
6
Output
#.#.#. .#.#.# #.#.#. .#.#.# #.#.#. .#.#.#
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.