Step 1: Divide the number into separate digits:
67003 => 6 7 0 0 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
6 to 7 = 1
7 to 0 = 7
0 to 0 = 0
0 to 3 = 3
3 to 6 = 3
Step 3: Combine the filters to a string:
1 7 0 3 3 = 17033