Step 1: Divide the number into separate digits:
37443 => 3 7 4 4 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
3 to 7 = 4
7 to 4 = 3
4 to 4 = 0
4 to 3 = 1
3 to 3 = 0
Step 3: Combine the filters to a string:
4 3 0 1 0 = 43010