Step 1: Divide the number into separate digits:
1832 => 1 8 3 2
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
1 to 8 = 7
8 to 3 = 5
3 to 2 = 1
2 to 1 = 1
Step 3: Combine the filters to a string:
7 5 1 1 = 7511