Step 1: Divide the number into separate digits:
35265 => 3 5 2 6 5
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
3 to 5 = 2
5 to 2 = 3
2 to 6 = 4
6 to 5 = 1
5 to 3 = 2
Step 3: Combine the filters to a string:
2 3 4 1 2 = 23412