Step 1: Divide the number into separate digits:
7293 => 7 2 9 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 2 = 5
2 to 9 = 7
9 to 3 = 6
3 to 7 = 4
Step 3: Combine the filters to a string:
5 7 6 4 = 5764