Step 1: Divide the number into separate digits:
67770 => 6 7 7 7 0
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
6 to 7 = 1
7 to 7 = 0
7 to 7 = 0
7 to 0 = 7
0 to 6 = 6
Step 3: Combine the filters to a string:
1 0 0 7 6 = 10076