Step 1: Divide the number into separate digits:
49960 => 4 9 9 6 0
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 9 = 5
9 to 9 = 0
9 to 6 = 3
6 to 0 = 6
0 to 4 = 4
Step 3: Combine the filters to a string:
5 0 3 6 4 = 50364