Task: Program Execution
Input (English): 20, ['4179', '4263', '1691', 'O', '6837', 'x', '971', '9507', 'p', '7433', 'r', 'v', '2249', 'O', '3879', '5425', '51', 'j', '1587', 'b', 'N', 'z', 'h', '3269', 'R', '4619', '353', '2905', 'v', '4145', 'y', '2347', '7015', '6155', '947', '819', '8869', '8875', '8659', '289', 'u', 'J', '9849', '4309', '3419']
Output (English): 4179, N, u