Step 1: Divide the number into separate digits:
99947 => 9 9 9 4 7
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
9 to 9 = 0
9 to 9 = 0
9 to 4 = 5
4 to 7 = 3
7 to 9 = 2
Step 3: Combine the filters to a string:
0 0 5 3 2 = 00532