Step 1: Divide the number into separate digits:
6793 => 6 7 9 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
6 to 7 = 1
7 to 9 = 2
9 to 3 = 6
3 to 6 = 3
Step 3: Combine the filters to a string:
1 2 6 3 = 1263