Step 1: Divide the number into separate digits:
8802 => 8 8 0 2
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 8 = 0
8 to 0 = 8
0 to 2 = 2
2 to 8 = 6
Step 3: Combine the filters to a string:
0 8 2 6 = 0826