Step 1: Divide the number into separate digits:
85202 => 8 5 2 0 2
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 5 = 3
5 to 2 = 3
2 to 0 = 2
0 to 2 = 2
2 to 8 = 6
Step 3: Combine the filters to a string:
3 3 2 2 6 = 33226