Task: Program Execution
Input (English): 1, 17, ['z', '8739', '4005', '99', '6507', '2965', '7101', '9459', 'Y', '6697', '8539', '8707', 'B', 'E', '4857', '2735', 'C', 'Q', '8371', 'u']
Output (English): z87394005996507296571019459Y669785398707BE48572735C