Task: Program Execution
Input (English): 2, 2, ['6429', 'B', 'b', 'o', '3299', '7181', '7699', '393', '6413', 'h', 'P', '1793', '4503', 'h', 'P', 'L', 'g', '5177', '3219', 'f', '4821', 'v', '5719']
Output (English): B