19个命令，139步
bump+ 9
a:
inbox
copyto 0
copyfrom 9
copyto 5
copyto 6
outbox
bump+ 6
b:
copyfrom 0
sub 5
jumpifneg a
copyfrom 5
outbox
copyfrom 5
add 6
copyto 6
sub 5
copyto 5
jump b