"""
Question 10
Question
Write a program that accepts a sequence of whitespace separated words as input and
prints the words after removing all duplicate words and sorting them alphanumerically.

Suppose the following input is supplied to the program:

hello world and practice makes perfect and hello world again

Then, the output should be:

again and hello makes perfect practice world

Hints:
In case of input data being supplied to the question, it should be assumed to be a console input.
We use set container to remove duplicated data automatically and then use sorted() to sort the data.
"""
#  input string splits -> converting into set() to store unique
#  element -> converting into list to be able to apply sort
word = sorted(list(set(input().split())))

print(" ".join(word))



                                                     
