Task: Program Execution
Input (English): 1, 3, ['W', '2563', '4207', '973', '8505', '3973', 'o', '8183', 'K', '6321', 'q', 'I', '747', 'P', '2523', '2551', '9557', 'q']
Output (English): 4207, 2563, W