input: Write a function to create a bar chart with given months and sales data using matplotlib.
  assert create_bar_chart(["Jan", "Feb", "Mar"], [100, 200, 300])==None
  assert create_bar_chart(["Apr", "May", "Jun"], [400, 500, 600])==None
  assert create_bar_chart(["Jul", "Aug", "Sep"], [700, 800, 900])==None
output: def create_bar_chart(months, sales):
      import matplotlib.pyplot as plt
  
      plt.bar(months, sales)
      plt.xlabel('Months')
      plt.ylabel('Sales')
      plt.title('Monthly Sales Data')
      plt.show()