Task: Program Execution
Input (English): 13, 21, ['3547', 'z', '9695', 'D', 'i', 'Q', '1503', 'I', 'Q', '6651', '6775', '6501', '697', '7579', 'X', '9595', 'b', 'Z', 'I', 'a', '3161']
Output (English): 1613aIZb5959X9757796