Step 1: Divide the number into separate digits:
89086 => 8 9 0 8 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 9 = 1
9 to 0 = 9
0 to 8 = 8
8 to 6 = 2
6 to 8 = 2
Step 3: Combine the filters to a string:
1 9 8 2 2 = 19822