What is the sum of the end of period balance costs for 2019?
{"": {"Acquisition Costs": "(Dollars in millions)", "Fulfillment Costs": ""}, "Beginning of period balance": {"Acquisition Costs": 322, "Fulfillment Costs": 187}, "Costs incurred": {"Acquisition Costs": 208, "Fulfillment Costs": 158}, "Amortization": {"Acquisition Costs": -204, "Fulfillment Costs": -124}, "End of period balance": {"Acquisition Costs": 326, "Fulfillment Costs": 221}}
acquisition_costs = df["End of period balance"]["Acquisition Costs"]
fulfillment_costs = df["End of period balance"]["Fulfillment Costs"]
answer = acquisition_costs + fulfillment_costs