Step 1: Divide the number into separate digits:
34466 => 3 4 4 6 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
3 to 4 = 1
4 to 4 = 0
4 to 6 = 2
6 to 6 = 0
6 to 3 = 3
Step 3: Combine the filters to a string:
1 0 2 0 3 = 10203