Task: Program Execution
Input (English): 12, 18, ['X', '2139', 'U', 'o', 'U', '7225', '1567', '2921', '9427', 'l', '1327', '1205', '2189', 'h', '7191', '2373', '9853', 'Y']
Output (English): 1205, 2189, h, 7191, 2373, 9853, Y