@1
MOV UP, RIGHT
MOV UP, ACC
SUB RIGHT
ADD 1
MOV ACC, RIGHT

@2
MOV LEFT, ACC
MOV ACC, LEFT
JEZ O
S:MOV UP, NIL
SUB 1
JNZ S
O:MOV LEFT, ACC
L:MOV UP, DOWN
SUB 1
JNZ L
D:MOV UP, ACC
JNZ D
MOV 0, DOWN

@6
MOV UP, DOWN

@9
MOV UP, DOWN
