Step 1: Divide the number into separate digits:
4898 => 4 8 9 8
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 8 = 4
8 to 9 = 1
9 to 8 = 1
8 to 4 = 4
Step 3: Combine the filters to a string:
4 1 1 4 = 4114