monitor

local width = 18
local height = 12

monitor = peripheral.wrap("right")

monitor.clear()
monitor.setCursorPos(1,1)

function writeCenterText(text, lheight)
    local mid = width / 2
    monitor.setCursorPos(mid - (#text / 2), lheight)
    monitor.write(text)
end

writeCenterText("Testing", 5)
writeCenterText("Testing1", 6)

local running = true

monitor.clear()

while(running) do
    print("Enter your message:")
    local input = read()
    if(input == "quitNow") then
        running = false
    else
        local text = input
        print("Enter the width:")
        local lwidth = tonumber(read())
        print("Enter the height:")
        local lheight = tonumber(read())
        monitor.clear()
        monitor.setCursorPos(lwidth, lheight)
        monitor.write(text)
    end
end