CC Desktop Redstone Control

m=peripheral.wrap("back")
a=0
b=0
c=0

while true do
term.setBackgroundColor(colors.black)
term.clear()
term.setCursorPos(1,1)
term.setTextColor(colors.white)

if a==0 then
rs.setOutput("right",true)
term.setBackgroundColor(colors.red)
term.write("Wand nach hinten")
else
rs.setOutput("right",false)
term.setBackgroundColor(colors.green)
term.write("Wand nach vorne")
end

term.setCursorPos(1,3)
if b==0 then
rs.setOutput("top",false)
term.setBackgroundColor(colors.red)
term.write("Alles Anhalten")
else
rs.setOutput("top",true)
term.setBackgroundColor(colors.green)
term.write("Betriebsbereit")
end

term.setCursorPos(1,5)
if c==0 then
rs.setOutput("left",true)
term.setBackgroundColor(colors.red)
term.write("Tür zu")
else
rs.setOutput("left",false)
term.setBackgroundColor(colors.green)
term.write("Tür auf")
end
print(1)
event, side, xPos, yPos = os.pullEvent("mouse_click")
print(1.5)
if yPos==1 then
if a==0 then
a=1
else
a=0
end
end
if yPos==3 then
if b==0 then
b=1
else
b=0
end
end
if yPos==5 then
if c==0 then
c=1
else
c=0
end
end
print(2)
end