xdddddddshop

MonitorSide = "left"
Monitor = peripheral.wrap(MonitorSide)

function DrawText(xPos, yPos, text, textColour, backgroundColour)
    Monitor.setBackgroundColor(backgroundColour)
    Monitor.setTextColor(textColour)
    Monitor.setCursorPos(xPos,yPos)
    Monitor.write(text)
end

function ClearMonitor()
    Monitor.setTextColor(colours.black)
    Monitor.setBackgroundColor(colours.black)
    Monitor.clear()
    Monitor.setCursorPos(1,1)
end

function GetRandomColour()
    local rand = math.random(1, 10)

    if (rand == 1) then return colours.brown   end
    if (rand == 2) then return colours.white   end
    if (rand == 3) then return colours.blue    end
    if (rand == 4) then return colours.brown   end
    if (rand == 5) then return colours.pink    end
    if (rand == 6) then return colours.red     end
    if (rand == 7) then return colours.orange  end
    if (rand == 8) then return colours.cyan    end
    if (rand == 9) then return colours.green   end
    if (rand == 10) then return colours.yellow
    else return colours.white end;
end

text = "xdddddddddddddd"
counter = 2
textLength = string.len(text)

function Main()
    while true do
        local monX, monY = Monitor.getSize()
        Monitor.setTextScale(3)
        ClearMonitor()
        counter = counter - 1

        DrawText(counter, 2, text, GetRandomColour(), colours.black)

        if (counter < (1 - textLength)) then
            counter = monX
        end

        sleep(0.2)
    end
end

Main()