Task: Program Execution
Input (English): 4, 5, ['b', 'Q', 'D', 'C', 'b', 'r', 'i', '6769', '3993', '5809', '2903', '9279', '3219', '5601', 'U', '3971', '2901', 'd', 'Q', 'f', '2033', 'n', '5955']
Output (English): bC