Step 1: Divide the number into separate digits:
09055 => 0 9 0 5 5
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 9 = 9
9 to 0 = 9
0 to 5 = 5
5 to 5 = 0
5 to 0 = 5
Step 3: Combine the filters to a string:
9 9 5 0 5 = 99505