Step 1: Divide the number into separate digits:
45753 => 4 5 7 5 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 5 = 1
5 to 7 = 2
7 to 5 = 2
5 to 3 = 2
3 to 4 = 1
Step 3: Combine the filters to a string:
1 2 2 2 1 = 12221