Fox And Snake · Interview Problem

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Codeforces

510/A

Medium

Strings

implementation

simulation

Fox And Snake

Print a pattern that represents a snake moving through a grid.

Acceptance 0%

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Problem Statement

Core description from the backend problem record.

Description

The problem requires printing a grid where a snake moves through rows following a specific pattern. For each odd-numbered row the snake is represented by '#' characters throughout, and for even-numbered rows, the snake occupies exactly one position either at the right-end or left-end alternately. The remaining positions in even-numbered rows are filled with '.' characters.

Input Format

The input consists of two integers n and m (1≤n,m≤50), where n is the number of rows and m is the number of columns of the grid.

Output Format

Output the pattern with n rows and m columns representing the snake.

Constraints

1 ≤ n, m ≤ 50

Examples

Sample cases returned by the problem API.

Example 1

Input

3 3

Output

###
..#
###

Explanation

Row 1 is all '#'. Row 2 has '#' at the right end. Row 3 is all '#'.

Example 2