#!/usr/bin/python

# Print the required header that tells the browser how to render the text.
print "Content-Type: text/plain\n\n"

# Define a function with default argument 'age' = 21.
def display_vars (first_name, last_name, age = 21):

  print (first_name, last_name, age)

# Call the function with all positionals.
display_vars("John", "Smith", 22)

# Call the function with all keywords.
display_vars(last_name = "Smith", first_name = "John", age = 22)

# Call the function with incomplete args; default age used.
display_vars("John", "Smith")