local password = "2good4u"
local nPos = 1 -- Position we're at in the password
repeat
    local event, p1, p2 = os.pullEventRaw()

    if event == "char" then
        if password:sub(nPos, nPos) == p1 then
            nPos = nPos + 1
        else
            nPos = 1 -- Wrong character, reset password.
        end
    elseif event == "terminate" then
        print("Too bad.")
    end
until nPos>#password -- Break when the attempt is longer than the password (e.g all characters are entered)