Step 1: Divide the number into separate digits:
0263 => 0 2 6 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 2 = 2
2 to 6 = 4
6 to 3 = 3
3 to 0 = 3
Step 3: Combine the filters to a string:
2 4 3 3 = 2433