#!/usr/bin/env python

# file: lecture_36/example.py
#
# demonstrate some simple data structures using scripting mode
#

# import system modules
#
import os
import sys

# main	program
#
def main(argv):
    
    letters = [sys.argv[1], sys.argv[2], sys.argv[3]]
    print(letters)
    print(set(letters))
    print(sorted(letters))

# begin	gracefully
#
if __name__ == "__main__":
    main(sys.argv[0:])
                                
#
# end of file