text: import sys
  import tty
  import termios
  
  def getch():
      fd = sys.stdin.fileno()
      old_settings = termios.tcgetattr(fd)
      try:
          tty.setraw(sys.stdin.fileno())
          ch = sys.stdin.read(1)
      finally:
          termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
      return ch
  