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: 18, 20, ['A', 'b', 'R', 't', '7799', 'i', '1299', 'C', '1925', '7093', '1785', '845', '4087', 'T', 'u', 'u', '8509', '3745', 'Q', '3195', 'G', '5411', 'q', 'S', '2697', '2641', 'T', 'T', '5901', '8205']

3195Q3745