Step 1: Divide the number into separate digits:
49786 => 4 9 7 8 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 9 = 5
9 to 7 = 2
7 to 8 = 1
8 to 6 = 2
6 to 4 = 2
Step 3: Combine the filters to a string:
5 2 1 2 2 = 52122