Task: Program Execution
Input (English): 18, 21, ['5153', 'f', '8173', 'H', 'Y', 'X', '6567', '3689', '6697', 'C', '2929', '4365', 'l', 'i', 'E', '6529', '9745', 'f', '1711', 'c', '9331', '4483']
Output (English): f, 1711, c, 9331