Step 1: Divide the number into separate digits:
00975 => 0 0 9 7 5
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 0 = 0
0 to 9 = 9
9 to 7 = 2
7 to 5 = 2
5 to 0 = 5
Step 3: Combine the filters to a string:
0 9 2 2 5 = 09225