Step 1: Divide the number into separate digits:
39922 => 3 9 9 2 2
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
3 to 9 = 6
9 to 9 = 0
9 to 2 = 7
2 to 2 = 0
2 to 3 = 1
Step 3: Combine the filters to a string:
6 0 7 0 1 = 60701