Step 1: Divide the number into separate digits:
1484 => 1 4 8 4
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
1 to 4 = 3
4 to 8 = 4
8 to 4 = 4
4 to 1 = 3
Step 3: Combine the filters to a string:
3 4 4 3 = 3443