Task: Program Execution
Input (English): 3, 4, ['Y', 'n', '9463', 'x', 's', 'H', '2319', '89', '8783', '6267', '4021', '1857', 'X', '4249', '4851', 'U', '2571', 'U', '9603']
Output (English): 9463, 2319, 4021, 4851, 9603