Task: Program Execution
Input (English): 1, 5, ['3397', 'T', '3807', 'K', '1869', 'q', '6573', 'r', 'z', 'X', 'O', 'W', 'B', 'X', 'i', '4199', 'R']
Output (English): 3397, q, O, 4199