Step 1: Divide the number into separate digits:
02943 => 0 2 9 4 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 2 = 2
2 to 9 = 7
9 to 4 = 5
4 to 3 = 1
3 to 0 = 3
Step 3: Combine the filters to a string:
2 7 5 1 3 = 27513