@0
#493/3/20

@1
MOV UP ACC
MOV ACC LAST
MOV ACC ANY
SUB 999
MOV ACC DOWN

@2


@3
MOV UP DOWN
SUB 999
SUB UP
JLZ A
SWP
MOV ACC DOWN
SUB 1
JRO ANY

A: MOV -2 LEFT
ADD UP
SAV

@4


@5
B: SUB UP
JLZ B
MOV ACC DOWN
MOV 0 ACC

@6