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: 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']

a87751619i13593515U