Step 1: Divide the number into separate digits:
80959 => 8 0 9 5 9
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 0 = 8
0 to 9 = 9
9 to 5 = 4
5 to 9 = 4
9 to 8 = 1
Step 3: Combine the filters to a string:
8 9 4 4 1 = 89441