Step 1: Divide the number into separate digits:
79767 => 7 9 7 6 7
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 9 = 2
9 to 7 = 2
7 to 6 = 1
6 to 7 = 1
7 to 7 = 0
Step 3: Combine the filters to a string:
2 2 1 1 0 = 22110