def sort(file_path):
	'''
	This function gets a text(str) and print a list with
	all unique words from the str but sorted scendingly.
	'''
	with open(file_path, "r") as file:
		unique_words_list = []
		add_word = ''
		for line in file:
			for word in line.split():
				for letter in word:
					if letter.isalpha:
						add_word += letter
				if add_word not in unique_words_list:
					unique_words_list.append(add_word)
				add_word = '' #reset word to add
		return(unique_words_list.sort())

def rev(file_path):
	'''
	This function gets a text(str) and print
	every line from the end to the start
	'''
	with open(file_path, "r") as file:
		for line in file:
			return(line[::-1])


def last(file_path):
	'''
	This function gets a text(str) and a n number from the user
	a prints the last n lines from the str
	every line from the end to the start
	'''
	with open(file_path, "r") as file:
		last = int(input("Enter a number: "))
		lines = file.readlines()
		for i in range(-last, 0):
			return(lines[i])


file_path = input("Enter a file path: ")
task = input("Enter a task: ")
if task == "sort":
	print_me = sort(file_path)
elif task == "rev":
	print_me = rev(file_path)
elif task == "last":
	print_me = last(file_path)
print(print_me)