BF$11$

$"$n LISP $$ REMOVE$-$NUM $$

$$:

$($REMOV$-$NUM'$(2$ A $6$ B $1$ C $7$ D$))($A B C D$)$

$($REMOV$-$NUM'$(3$ A $4$ B $(1$ E$)7$ D$))($A B $($E$)$ D$)"$