A Bingo card consists of 5 columns of 5 numbers which are labelled with the letters B, I, N, G and O. There are 15 numbers that can appear under each letter. In particular, the numbers that can appear under the B range from 1 to 15, the numbers that can appear under the I range from 16 to 30, the numbers that can appear under the N range from 31 to 45, and so on.

Write a function that creates a random Bingo card and stores it in a dictionary. The keys will be the letters B, I, N, G and O. The values will be the lists of five numbers that appear under each letter. Write a second function that displays the Bingo card with the columns labelled appropriately. Use these functions to write a program that displays a random Bingo card. Ensure that the main program only runs when the file containing your solution has not been imported into another program.