In SSTF, it is same as Closest Cylinder First, therefore the sequence will be 50,49,53,55,65,65,78,36,20,16,12,3,1.
In Elevator Disk Scheduling policy, head moves in one direction and goes till the end the process the request of the other end. Head can move in any of the direction first since it is not specified. So there are two possible sequence
Assuming 78 is the extreme right cylinder and 1 be extreme left cylinder.
1st → 50, 49, 36, 20, 16, 12, 3, 1, 53, 55, 65, 65, 78
2nd → 50, 53, 55, 65, 65, 78, 49, 36, 20, 16, 12, 3, 1