Task: Program Execution
Input (English): 18, 21, ['I', '9837', 'I', 'k', '8659', '3405', '3247', '787', '6707', '2855', '5481', 'D', 'D', 'p', 'D', '9173', '9317', 'q', '4815', 'Z', '9827', '7875', '2151', 'R', '2833', 'q']
Output (English): 9827, Z, 4815, q