--version2

local monitor = peripheral.wrap("monitor_0")

--greeting function
function Greet()
  monitor.setBackgroundColor(colors.blue)
  monitor.setTextColor(colors.yellow)
  monitor.setCursorPos(1,1)
  monitor.setTextScale(3)
  monitor.clear()
  monitor.write("Speak Friend")
  monitor.setCursorPos(3,2)
  monitor.write("and Enter")
end

function Wrong()
  monitor.setBackgroundColor(colors.red)
  monitor.setTextColor(colors.black)
  monitor.setCursorPos(2,2)
  monitor.setTextScale(4)
  monitor.clear()
  monitor.write("WRONG!")
end

function Right()
  monitor.setBackgroundColor(colors.green)
  monitor.setTextColor(colors.white)
  monitor.setCursorPos(2,2)
  monitor.setTextScale(4)
  monitor.clear()
  monitor.write("Welcome!")
end

--password function
function PWD()
  while true do
    redstone.setOutput("back", true)
    term.clear()
    term.setCursorPos(1, 1)
    print("Enter Password:")
    input = read("*")
    if input == "friend" then
      redstone.setOutput("back", false)
      Right()
      sleep(4)
      redstone.setOutput("back", true)
      Greet()
    else
      Wrong()
      sleep(5)
      Greet()
    end
  end
end

--Main Program  
Greet()
PWD()