In this task, you are given inputs 'i', 'j', and A, where 'i' and 'j' are integers and A is a list. A list is shown by two brackets and comma-separated numbers and characters inside, like ['1', '12', 'l']. You need to concatenate all elements of A from the ith element to the jth element, and then reverse the resulting string. 'i' and 'j' will be non-negative, and will always have a value less than the length of A. 'i' will always be less than 'j'. Perform the operations in order, i.e., do not reverse first and then concatenate.
--------
Question: 8, 12, ['C', 'w', 'Q', '8125', '4579', '8495', '363', 'a', 'C', 'T', '7905', '2631']

Answer: 13625097TCa


Question: 4, 16, ['S', '5719', '173', 'P', 'a', '5791', 'e', '6279', 'q', '2585', '9533', 'r', '849', 'h', '3259', '3707', '4939', 'X', 'e']

Answer: 70739523h948r33595852q9726e1975aP


Question: 18, 19, ['797', '1151', '7741', 'j', '7301', '275', 'S', 'm', '8653', '9355', 'N', 'A', '6349', '4987', 'z', '4441', '9803', 'n', 'V', 'q', '6517', 'k', 'n', 's', 'o', 't', 'i', '8559', 'u', 'Z']

Answer:
Vn