Step 1: Divide the number into separate digits:
00863 => 0 0 8 6 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 0 = 0
0 to 8 = 8
8 to 6 = 2
6 to 3 = 3
3 to 0 = 3
Step 3: Combine the filters to a string:
0 8 2 3 3 = 08233