<human>:  what variable to use to quit a program in.
<bot>: Here is a Python function to what variable to quit a program

import sys

def quit_program():
  """
  Quit the program.
  """
  print("Quitting the program.")
  sys.exit()

# Enter the command
command ="red airplane"

# Calling the function
if command == "quit":
  quit_program()

#Remember to inspect code for bugs.