Step 1: Divide the number into separate digits:
5808 => 5 8 0 8
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
5 to 8 = 3
8 to 0 = 8
0 to 8 = 8
8 to 5 = 3
Step 3: Combine the filters to a string:
3 8 8 3 = 3883