Task: Program Execution
Input (English): 5, 21, ['9055', '8993', '6591', 'U', 'g', '8745', 'L', 'k', 'k', '3671', 'b', 'B', '2859', 'k', 'g', '4151', 'G', 'C', '3843', '2649', '1023']
Output (English): g8745Lkk3671bB2859kg4151GC384326491023