Step 1: Divide the number into separate digits:
8776 => 8 7 7 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 7 = 1
7 to 7 = 0
7 to 6 = 1
6 to 8 = 2
Step 3: Combine the filters to a string:
1 0 1 2 = 1012