Step 1: Divide the number into separate digits:
54299 => 5 4 2 9 9
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
5 to 4 = 1
4 to 2 = 2
2 to 9 = 7
9 to 9 = 0
9 to 5 = 4
Step 3: Combine the filters to a string:
1 2 7 0 4 = 12704