Step 1: Divide the number into separate digits:
94043 => 9 4 0 4 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
9 to 4 = 5
4 to 0 = 4
0 to 4 = 4
4 to 3 = 1
3 to 9 = 6
Step 3: Combine the filters to a string:
5 4 4 1 6 = 54416