Task: Program Execution
Input (English): 19, 21, ['b', '3379', 'U', '1987', 'd', 'u', 'z', 'u', 's', 'H', '1109', '9005', '5557', '6169', '2945', '7431', 'z', '3711', '6603', 'J', '4851', '2097', '4387', 'C', 'F', 'S']
Output (English): 4851, J, 6603