Step 1: Divide the number into separate digits:
74535 => 7 4 5 3 5
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 4 = 3
4 to 5 = 1
5 to 3 = 2
3 to 5 = 2
5 to 7 = 2
Step 3: Combine the filters to a string:
3 1 2 2 2 = 31222