Step 1: Divide the number into separate digits:
8996 => 8 9 9 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 9 = 1
9 to 9 = 0
9 to 6 = 3
6 to 8 = 2
Step 3: Combine the filters to a string:
1 0 3 2 = 1032