you can change
$r(A,Z) $+ $r(a,z) $+ $r(a,z) $+ $r(a,z) $+ $r(a,z) $+ _ $+ $+ $r(A,Z) $+ $r(a,z) $+ $r(1,999)
to
$+($r(A,Z),$r(a,z),$r(a,z),$r(a,z),$r(a,z),_,$r(A,Z),$r(a,z),$r(1,999))
same thing but look\'s nicer =P