Step 1: Divide the number into separate digits:
53354 => 5 3 3 5 4
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
5 to 3 = 2
3 to 3 = 0
3 to 5 = 2
5 to 4 = 1
4 to 5 = 1
Step 3: Combine the filters to a string:
2 0 2 1 1 = 20211