Step 1: Divide the number into separate digits:
70353 => 7 0 3 5 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 0 = 7
0 to 3 = 3
3 to 5 = 2
5 to 3 = 2
3 to 7 = 4
Step 3: Combine the filters to a string:
7 3 2 2 4 = 73224