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. Input Format: The only line of input contains an integer n (1 ≤ n ≤ 9). Output Format: Output an image of n × n chessboard. Note: None