@1
MOV UP, RIGHT

@2
MOV LEFT, ACC
SAV
JEZ C
S: MOV UP, NIL
SUB 1
JNZ S
C: SWP
SUB LEFT
SUB 1
D: MOV UP, DOWN
ADD 1
JLZ D
MOV 0, DOWN
R: MOV UP, ACC
JNZ R

@6
MOV UP, DOWN

@9
MOV UP, DOWN
