Task: Program Execution
Input (English): 15, 21, ['v', 't', '4437', '8433', 'e', '5355', 'R', 'm', 'g', 'z', 'g', '3967', 'I', '1939', '9819', 'O', '7669', 'Q', '2359', 'O', '8057', '777', '4517', 'F', 'v', '9421', 'e']
Output (English): 8057O2359Q7669O9819