Step 1: Divide the number into separate digits:
92125 => 9 2 1 2 5
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
9 to 2 = 7
2 to 1 = 1
1 to 2 = 1
2 to 5 = 3
5 to 9 = 4
Step 3: Combine the filters to a string:
7 1 1 3 4 = 71134