Step 1: Divide the number into separate digits:
56635 => 5 6 6 3 5
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
5 to 6 = 1
6 to 6 = 0
6 to 3 = 3
3 to 5 = 2
5 to 5 = 0
Step 3: Combine the filters to a string:
1 0 3 2 0 = 10320