Task: Program Execution
Input (English): 8, 14, ['N', '2159', 'B', '6469', 'J', '2129', 'l', 'U', '3515', '1359', 'i', '1619', '8775', 'a', '8723', 'e', 'Y', 'x', '7629', '1705', '635', '8703', '3327', 'U']
Output (English): a87751619i13593515U