input: Write a python function to plot sales of two products and display the plot using matplotlib.
  assert plot_sales([10, 15, 12, 18, 20], [5, 8, 9, 10, 15]) is None
  assert plot_sales([1, 2, 3, 4, 5], [5, 4, 3, 2, 1]) is None
  assert plot_sales([20, 30, 40, 50, 60], [60, 50, 40, 30, 20]) is None
output: import matplotlib.pyplot as plt
  
  def plot_sales(product1_sales, product2_sales):
      plt.plot(product1_sales, label='Product 1')
      plt.plot(product2_sales, label='Product 2')
      plt.xlabel('Time')
      plt.ylabel('Sales')
      plt.title('Sales of Product 1 and Product 2')
      plt.legend()
      plt.show()