Step 1: Divide the number into separate digits:
2614 => 2 6 1 4
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
2 to 6 = 4
6 to 1 = 5
1 to 4 = 3
4 to 2 = 2
Step 3: Combine the filters to a string:
4 5 3 2 = 4532