Step 1: Divide the number into separate digits:
43756 => 4 3 7 5 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 3 = 1
3 to 7 = 4
7 to 5 = 2
5 to 6 = 1
6 to 4 = 2
Step 3: Combine the filters to a string:
1 4 2 1 2 = 14212