Task: Program Execution
Input (English): 18, 19, ['m', '2435', 'l', 'P', '7113', 'S', '4647', '2493', 'C', 'Q', 'a', 'g', '4365', 'G', 'B', '1105', '9259', '5637', 'G', 't']
Output (English): G5637