Definition: In this task, you are given inputs i, j, and A, where i and j are integers and A is a list. You need to find all elements of A from the ith element to the jth element, reverse the order in which they occur, and then concatenate them to output the resultant 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 concatenate the elements and then reverse the string.
Input: 6, 17, ['J', '2747', 'H', 'P', 'a', '5339', '9575', 'T', '3107', '791', '3201', '3759', 'G', 'A', '8193', '8551', '5135', '2865', 'x', '6989', '3115']

513585518193AG375932017913107T95755339