Task: Program Execution
Input (English): 7, ['9707', 'H', '6773', 'h', '7491', 'b', '2975', '6691', '253', 'c', '4421', '3019', '2747', '4251', 'u', '3305', 'C', '983', 'c', '5075']
Output (English): 9707, 6691, u