Step 1: Divide the number into separate digits:
49030 => 4 9 0 3 0
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 9 = 5
9 to 0 = 9
0 to 3 = 3
3 to 0 = 3
0 to 4 = 4
Step 3: Combine the filters to a string:
5 9 3 3 4 = 59334