input: Write a function to generate a random number between 0 and 9 and print it. The function should be named `generate_random_number`.
  assert generate_random_number()==3
  assert generate_random_number()==0
  assert generate_random_number()==9
  assert generate_random_number()==5
  assert generate_random_number()==2
output: import random
  
  def generate_random_number():
      return random.randint(0, 9)