Step 1: Divide the number into separate digits:
7083 => 7 0 8 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 0 = 7
0 to 8 = 8
8 to 3 = 5
3 to 7 = 4
Step 3: Combine the filters to a string:
7 8 5 4 = 7854