$ sudo apt-add-repository ppa:brightbox/ruby-ng
$ sudo apt update

$ sudo apt install ruby2.5 ruby2.5-dev

gem install asciidoctor

asciidoctor readme.adoc

def start():
	while True:
	    row = input('Enter a string ("escape" - quit the program): ')
	    if row == 'escape':
	        break
	    row_low = row.lower()
	    is_palindrome = True
	    if row_low != row_low[::-1]:
	        is_palindrome = False
	    if is_palindrome:
	        print(row, 'is a palindrome')
	    else:
	        print(row, 'is not a palindrome')

if __name__ == '__main__':
    start()