Task: Program Execution
Input (English): 5, 21, ['M', 'C', '7257', '5909', '6247', 'B', '3941', 'o', '4695', 'v', '5033', '6439', 'z', '9865', '8685', '9915', '2865', '5899', '2491', 'i', 'y', 'q', '7381']
Output (English): 6247B3941o4695v50336439z986586859915286558992491iy