Step 1: Divide the number into separate digits:
08089 => 0 8 0 8 9
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 8 = 8
8 to 0 = 8
0 to 8 = 8
8 to 9 = 1
9 to 0 = 9
Step 3: Combine the filters to a string:
8 8 8 1 9 = 88819