input: Write a python function to generate a random number between a given range (lhs, rhs).
  assert lhs <= random_number_generator(1, 10) <= rhs
  assert lhs <= random_number_generator(50, 100) <= rhs
  assert lhs <= random_number_generator(-10, 10) <= rhs
output: import random
  
  def random_number_generator(lhs, rhs):
      return random.randint(lhs, rhs)