Step 1: Divide the number into separate digits:
94393 => 9 4 3 9 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
9 to 4 = 5
4 to 3 = 1
3 to 9 = 6
9 to 3 = 6
3 to 9 = 6
Step 3: Combine the filters to a string:
5 1 6 6 6 = 51666