FarmSap sells heads of lettuce to customers based on the number of lettuce purchased. The prices follows:

If a customer purchases 1-3 lettuce head(s), he or she must pay 5$ per head

If a customer purchases 4-9 or 11-19 lettuce heads, he or she must pay 3$ per head.

If a customer purchases a multiple of 10 number of lettuce heads, he or she must pay 2$ per head.

If a customer purchases any other amount, he or she must pay 4$ per head.

Write a script in Thonny that asks the user how many heads of lettuce they are buying and displays the total cost for the purchase.