Task: Program Execution
Input (English): 1, 6, ['q', '6487', 'p', '9815', '127', 's', '6311', 'q', '8639', 'U', '1433', '3039', '6949', 'b', '7475', '2939', '9943', 'n']
Output (English): q, 6311, 6949