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

@2
MOV LEFT, ACC
JEZ C
S: MOV UP, NIL
SUB 1
JNZ S
C: MOV LEFT, ACC
D: MOV UP, DOWN
SUB 1
JGZ D
MOV 0, DOWN
R: MOV UP, ACC
JNZ R

@6
MOV UP, DOWN

@9
MOV UP, DOWN
