Task: Program Execution
Input (English): 19, 20, ['t', '4917', 'u', '3689', '9807', '8181', 'v', 'D', '6421', '3753', '3475', '133', 'N', 'Y', '4943', '6451', '8471', '6667', 'Y', '199', 'Z', 'j']
Output (English): 199Y