In lab 8, we used top-down design to make a herd of turtles move across the screen. The main program is: def main(): welcomeMessage() # Writes a welcome message to the shell numTurtles = getInput() # Ask for number of turtles w = setUpScreen() # Set up a green turtle window turtleList = setUpTurtles(numTurtles) # Make a list of turtles for i in range(10): moveForward(turtleList) # Move each turtle in the list forward stamp(turtleList) # Stamp where the turtle stopped Write the complete function definition for getInput().