Step 1: Divide the number into separate digits:
09794 => 0 9 7 9 4
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 9 = 9
9 to 7 = 2
7 to 9 = 2
9 to 4 = 5
4 to 0 = 4
Step 3: Combine the filters to a string:
9 2 2 5 4 = 92254