Write an application to pre$-$sell a limited number of cinema tickets. Each buyer can buy up to $4$ tickets. No more than $20$ tickets can be sold total. Prompt the user for the desired number of tickets and then display the number of remaining tickets after their purchase. Repeat until all tickets have been sold. Then display the total number of buyers.

Please use the following in your code:

$1.$ function

$2.$ input

$3.$ output

$4.$ accumulator

$5.$ if statement

$6.$ loop