Step 1: Divide the number into separate digits:
55822 => 5 5 8 2 2
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
5 to 5 = 0
5 to 8 = 3
8 to 2 = 6
2 to 2 = 0
2 to 5 = 3
Step 3: Combine the filters to a string:
0 3 6 0 3 = 03603