Step 1: Divide the number into separate digits:
37223 => 3 7 2 2 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
3 to 7 = 4
7 to 2 = 5
2 to 2 = 0
2 to 3 = 1
3 to 3 = 0
Step 3: Combine the filters to a string:
4 5 0 1 0 = 45010