Step 1: Divide the number into separate digits:
6095 => 6 0 9 5
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
6 to 0 = 6
0 to 9 = 9
9 to 5 = 4
5 to 6 = 1
Step 3: Combine the filters to a string:
6 9 4 1 = 6941