slot = arg[1]
if slot ~= "get" then
    if slot == "all" then
        for i = 1, 16 do
            turtle.select(i)
            turtle.refuel()
        end
        turtle.select(1)
    else
        turtle.select(tonumber(slot))
        turtle.refuel()
    end
end
lvl = turtle.getFuelLevel()
print(lvl)