Step 1: Divide the number into separate digits:
49778 => 4 9 7 7 8
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 9 = 5
9 to 7 = 2
7 to 7 = 0
7 to 8 = 1
8 to 4 = 4
Step 3: Combine the filters to a string:
5 2 0 1 4 = 52014