Step 1: Divide the number into separate digits:
4260 => 4 2 6 0
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 2 = 2
2 to 6 = 4
6 to 0 = 6
0 to 4 = 4
Step 3: Combine the filters to a string:
2 4 6 4 = 2464