Step 1: Divide the number into separate digits:
4886 => 4 8 8 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 8 = 4
8 to 8 = 0
8 to 6 = 2
6 to 4 = 2
Step 3: Combine the filters to a string:
4 0 2 2 = 4022