You work for a Defense contracting company. The company develops software applications which perform intensive calculations in the area of Mechanical Engineering related to metals for ship building. You have a 3-year contract and decide to purchase reserved EC2 instances for a 3-year duration. You are informed that the particular program has been cancelled abruptly and negotiations have brought the contract to an amicable conclusion one year early. What can you do to stop incurring charges and save money on the EC2 instances