@1
MOV UP, ACC
MOV ACC, DOWN
MOV ACC, DOWN

@5
MOV UP, NIL
N: MOV UP, ACC
MOV ACC, DOWN
JEZ O
L: SAV
SUB UP
JGZ N
MOV UP, DOWN
SWP
JMP L
O: SWP
MOV ACC, DOWN

@8
L: MOV UP, ACC
MOV ACC, RIGHT
MOV ACC, RIGHT
JNZ L
MOV UP, DOWN

@9
L: SAV
SUB LEFT
JGZ M
MOV LEFT, ACC
JMP L
M: MOV LEFT, ACC
JNZ S
SWP
MOV ACC, DOWN
S: SWP
