Task: Program Execution
Input (English): 2, 4, ['b', 'B', 'z', 'r', '2425', '4391', 'd', 'I', 'o', '2185', 'W', 'c', '7201', 'V', '6951', 'K', 'f', 'k', '2263', '4005', '615']
Output (English): r, z, B