help with lua on numbers and probabilty

[Realn0whereman]

up = Image.load("up.png")
down = Image.load("down.png")
left = Image.load("left.png")
right = Image.load("right.png")
norm = Image.load("norm.png")

screen:blit(0, 0, norm, false)
screen.flip()
while true do
screen.waitVblankStart()
pad = Controls.read()
number = math.random(1,4)
if number == 1 then

if pad:cross() then
screen:blit(0, 0, down)
screen.flip()
screen.waitVblankStart(50)
end


if pad:circle() then
screen:blit(0, 0, right)
screen.flip()
screen.waitVblankStart(50)
end

if pad:square() then
screen:blit(0, 0, left)
screen.flip()
screen.waitVblankStart(50)
end

if pad:triangle() then
screen:blit(0, 0, up)
screen.flip()
screen.waitVblankStart(50)
end



end

i want to either A:
read from a file and display data

like if my txt file is like so:
1
9
5
7
3
6
3
7
4
7
3
then it will read the numbers one by one and display them.
if line 1 == 1 then
screen:blit (...........)

or B:

i want to generate a random number and record it and then wait for the user to input data before a certain number of Vblanks
please help

thank in advance