Step 1: Divide the number into separate digits:
69625 => 6 9 6 2 5
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
6 to 9 = 3
9 to 6 = 3
6 to 2 = 4
2 to 5 = 3
5 to 6 = 1
Step 3: Combine the filters to a string:
3 3 4 3 1 = 33431