CLS
SCREEN 1
x=150
y=100
CIRCLE (x,y),20,2
DO UNTIL a$="q"
a$=INKEY$
IF a$="a" THEN GOSUB a: 
IF a$="b" THEN GOSUB b:
IF a$="c" THEN GOSUB c:
IF a$="d" THEN GOSUB d:
LOOP
END
a:CIRCLE (x,y),20,0 : y=y-5: CIRCLE (x,y),20,2:RETURN
b:CIRCLE (x,y),20,0 : y=y+5: CIRCLE (x,y),20,2:RETURN
c:CIRCLE (x,y),20,0 : x=x-5: CIRCLE (x,y),20,2:RETURN
d:CIRCLE (x,y),20,0 : x=x+5: CIRCLE (x,y),20,2:RETURN