Task: Program Execution
Input (English): 6, 7, ['s', '5743', 'X', '2367', '3947', 'R', '6503', 'I', 'i', 's', '8585', '2697', 'T', 'v', '8529', '1853', 'Q', 'm', '8943', 'X', 'T', 'W', 'a', 'J', 'g']
Output (English): 6503R