help with screen:print()

[jolli]

I have a problem with this code:

rosso = Color.new(255, 0, 0)
oldpad = Controls.read()
while true do
screen:clear()
pad = Controls.read()
if pad:cross() and not oldpad:cross() then
screen:print(10, 10, "Hello Word", rosso)
end
while true do
screen.flip()
screen.waitVblankStart()
oldpad = pad
end


when I press cross,the luaplayer print "Hello World" for a second but I want that stay printed on the screen