Designer Door Mat | HackerRank

Mr. Vincent works in a door mat manufacturing company. One day, he designed a new door mat with the following specifications:
  • Mat size must be X. ( is an odd natural number, and  is  times .)
  • The design should have 'WELCOME' written in the center.
  • The design pattern should only use |, . and - characters.
Sample Designs
    Size: 7 x 21 
    ---------.|.---------
    ------.|..|..|.------
    ---.|..|..|..|..|.---
    -------WELCOME-------
    ---.|..|..|..|..|.---
    ------.|..|..|.------
    ---------.|.---------
    
    Size: 11 x 33
    ---------------.|.---------------
    ------------.|..|..|.------------
    ---------.|..|..|..|..|.---------
    ------.|..|..|..|..|..|..|.------
    ---.|..|..|..|..|..|..|..|..|.---
    -------------WELCOME-------------
    ---.|..|..|..|..|..|..|..|..|.---
    ------.|..|..|..|..|..|..|.------
    ---------.|..|..|..|..|.---------
    ------------.|..|..|.------------
    ---------------.|.---------------
Input Format
A single line containing the space separated values of  and .
Constraints
Output Format
Output the design pattern.
Sample Input
9 27
Sample Output
------------.|.------------
---------.|..|..|.---------
------.|..|..|..|..|.------
---.|..|..|..|..|..|..|.---
----------WELCOME----------
---.|..|..|..|..|..|..|.---
------.|..|..|..|..|.------
---------.|..|..|.---------
------------.|.------------

Solution

n, m = map(int,input().split())
pattern = [('.|.'*(2*i + 1)).center(m, '-') for i in range(n//2)]
# print('\n'.join(pattern))
print('\n'.join(pattern + ['WELCOME'.center(m, '-')] + pattern[::-1]))

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