Task: Program Execution
Input (English): 1, 5, ['9479', 'X', 'a', 'V', 'U', 'U', 's', 'i', '4091', 'j', 'O', 'P', 'M', '2749', 'Y', 'r', 's', '9123', 't', '5829', '731', 'u', '5805', 'R', '2393', 'b', 'B']
Output (English): 9479XaVU