@1
MOV DOWN, RIGHT
L: MOV UP, ACC
JEZ D
MOV ACC, RIGHT
JMP L
D: MOV ACC, DOWN

@4
MOV RIGHT, UP
MOV UP, RIGHT

@5
MOV ACC, LEFT
MOV LEFT, NIL
L: MOV UP, ACC
MOV ACC, DOWN
JNZ L

@7
MOV UP, DOWN
