Step 1: Divide the number into separate digits:
9293 => 9 2 9 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
9 to 2 = 7
2 to 9 = 7
9 to 3 = 6
3 to 9 = 6
Step 3: Combine the filters to a string:
7 7 6 6 = 7766