The Recursive Skipper

You are summing numbers in a nested list. However, if an element is a sub-list, you must evaluate the sum of that sub-list first. Let that sum be 'S'. After processing the sub-list, you must skip the next 'S % 3' elements in the current list level. Input: A string representing a nested list of integers. Output: The total sum of all processed elements. Example: Input: [10, [2, 1], 5, 8] 1. Process 10 (Sum=10) 2. Process sub-list [2, 1]. Sum=3. 3. Since S=3, skip next 3 % 3 = 0 elements. 4. Process 5 (Sum=10+3+5=18) 5. Process 8 (Sum=18+8=26) Output: 26 Example 2: [10, [5], 2, 1] 1. 10. 2. [5] returns 5. 3. Skip 5 % 3 = 2 elements (skips 2 and 1). Output: 15