Step 1: Divide the number into separate digits:
4963 => 4 9 6 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 9 = 5
9 to 6 = 3
6 to 3 = 3
3 to 4 = 1
Step 3: Combine the filters to a string:
5 3 3 1 = 5331