Step 1: Divide the number into separate digits:
85126 => 8 5 1 2 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 5 = 3
5 to 1 = 4
1 to 2 = 1
2 to 6 = 4
6 to 8 = 2
Step 3: Combine the filters to a string:
3 4 1 4 2 = 34142