Task: Program Execution
Input (English): 19, 20, ['3457', 'R', 'O', '1711', 'E', '5843', '9027', '2515', '2887', '2165', 'C', 'p', '1933', '5139', '6285', '2207', '9159', '4087', 'L', '3439', 'd', '1603', 'Z']
Output (English): 3439L