Question $3)[5$ points$]$ Below, a procedure named "get$-$numbers$-$only" is given, which has a single

parameter named $"$lst$".$ Assume that $"$lst$"$ is a list $($no need to check if it is really a list or not$).$ The

procedure produces the same list as $"1$st$"$ where all the items which are not numbers are dropped, but

the elements of $"$lst$"$ which are numbers are kept in the same order as given in $"$lst$".$ You can also

see some example use of this procedure below. Note that if an element of $"$lst$"$ is sublist, this sublist

is also dropped. Please fill$-$in the blanks to implement this procedure.

$1]>($define get$-$numbers$-$only $($lambda $($lst$)$

$($if $(.....$ lst$)$

$\text{'}()$

$($if $($number$?($car lst$))$

$(......($car lst$)($get$-$numbers$-$only $(.....$lst$)))$

$.$ lst