local monitor = peripheral.wrap("back")

ctd = 10


while true do -- check for updates on redstone
    sleep(1)
    if rs.getInput("Left") == true
        for i = 1, 10 do
            sleep(1)
            monitor.write(ctd)
            ctd = ctd - 1
        end
    else
        print("Nope!")
    end
end