Step 1: Divide the number into separate digits:
6272 => 6 2 7 2
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
6 to 2 = 4
2 to 7 = 5
7 to 2 = 5
2 to 6 = 4
Step 3: Combine the filters to a string:
4 5 5 4 = 4554