Step 1: Divide the number into separate digits:
25814 => 2 5 8 1 4
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
2 to 5 = 3
5 to 8 = 3
8 to 1 = 7
1 to 4 = 3
4 to 2 = 2
Step 3: Combine the filters to a string:
3 3 7 3 2 = 33732