Task: Program Execution
Input (English): 4, 9, ['L', '883', 'l', 'x', 'A', 'R', '6395', '6723', '6439', 'f', 'q', 'R', '5345', '9431', 'f', '6755', 'j', 'u', '8117', 'F', '4929']
Output (English): 643967236395RAx