Step 1: Divide the number into separate digits:
9063 => 9 0 6 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
9 to 0 = 9
0 to 6 = 6
6 to 3 = 3
3 to 9 = 6
Step 3: Combine the filters to a string:
9 6 3 6 = 9636