Task: Program Execution
Input (English): 4, ['1689', 't', 'C', '4299', '7475', '3755', 'H', 'y', '9469', '5251', 'x', '1339', '227', 'C', 'M', '621', 's', '9235', 'a', '2891']
Output (English): 1689, t, C, 4299