Lunar Landing

You are landing on the moon and have taken over manual control 500 feet above a good landing spot. You have a downward velocity of 50 feet per second and 120 units of fuel remaining. After each second, the height, velocity, and remaining fuel will be reported. After each report, enter the number of units of fuel you wish to burn during the next second. When you contact the lunar surface, your decent engine will automatically cut off and you will be given a report of your landing speed and remaining fuel. Very tough but solvable!