ChestB = peripheral.wrap("back")
ChestL = peripheral.wrap("left")
DisplayR = peripheral.wrap("right")
while true do
    Items = {}
    CurrentLine = 0
    for slot, item in pairs(ChestL.list()) do
        if not Items[item.name] then
            Items[item.name] = 0
        end
        Items[item.name] = Items[item.name] + item.count

    end
    for slot, item in pairs(ChestB.list()) do
        if not Items[item.name] then
            Items[item.name] = 0
        end
        Items[item.name] = Items[item.name] + item.count
    end
    DisplayR.clear()
    for item, count in pairs(Items) do
        CurrentLine = CurrentLine + 1
        DisplayR.setCursorPos(1,CurrentLine)
        DisplayR.write(item.." - "..count)
    end
    sleep(2)
end