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: 14, 20, ['F', 'L', '7689', 'N', 'D', '9869', '9651', 'o', 'e', 'J', 'n', '8909', '671', 'v', '7017', '1181', 'U', '9849', '1707', 'd', '3943', '2107', 'a']

d17079849U11817017v