Step 1: Divide the number into separate digits:
9822 => 9 8 2 2
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
9 to 8 = 1
8 to 2 = 6
2 to 2 = 0
2 to 9 = 7
Step 3: Combine the filters to a string:
1 6 0 7 = 1607