Task: Program Execution
Input (English): 19, 19, ['4917', '3489', 'B', 'O', 'O', '2209', '689', '7665', '1711', '5765', '3231', '1499', '6453', 'X', '8623', 'l', '5771', 'a', 'k', '9469', '1699']
Output (English): k