Task: Program Execution
Input (English): 3, ['2809', 'H', '3579', '9109', '2397', 'T', '1491', 'b', 'f', '2717', 'Z', 'n', '3973', '3543', 'W', 'b', 'n', 'D']
Output (English): 2809, 9109, 1491, 2717, 3973, b