Task: Program Execution
Input (English): 7, ['a', 'B', '3961', 'A', '5245', '7211', 'A', 'a', '9143', 'E', '867', 'K', '6997', '5595', 'I', '3215']
Output (English): a, B, 3961, A, 5245, 7211, A