ss

local sign = peripheral.wrap('top')

while true do
    local id = read()
    if id ~= '' then
        sign.setLine(1, '¥A71[Buy]')
        sign.setLine(2, '1')
        sign.setLine(3, tostring(id))
        sign.setLine(4, '$0.01')
    else
        sign.setLine(1, '')
        sign.setLine(2, '')
        sign.setLine(3, '')
        sign.setLine(4, '')
        os.reboot()
    end
end