import matplotlib.pyplot as plt


labels = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
product_A = [20, 35, 30, 35, 27, 43, 24, 34, 14, 27, 22, 50]
product_B = [25, 32, 34, 20, 25, 34, 54, 23, 43, 33, 27, 29]

width = 0.35      

fig, ax = plt.subplots()

ax.bar(labels, product_A, width,  label='Product A')
ax.bar(labels, product_B, width,  bottom=product_A,
       label='Product B')

ax.set_ylabel('Scores')
ax.set_title('Sales of Product A and Product B')
ax.legend()

plt.show()