Step 1: Divide the number into separate digits:
0105 => 0 1 0 5
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 1 = 1
1 to 0 = 1
0 to 5 = 5
5 to 0 = 5
Step 3: Combine the filters to a string:
1 1 5 5 = 1155