Step 1: Divide the number into separate digits:
08253 => 0 8 2 5 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 8 = 8
8 to 2 = 6
2 to 5 = 3
5 to 3 = 2
3 to 0 = 3
Step 3: Combine the filters to a string:
8 6 3 2 3 = 86323