Task: Program Execution
Input (English): 8, 8, ['6149', 'A', 'b', '2271', '8501', 'b', 'j', 'Z', '8411', '3517', '9021', '2349', '3351', 'a', 'A', 'x', '9389', 'q', 'Q', 'b']
Output (English): Z