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: 11, 18, ['Z', '7557', '475', '3051', 'g', 'x', '1575', '6209', 'u', 'o', 'o', '6953', 'n', 'H', '5399', '4939', 'l', '2869', '665', 'B', '7793']

2869l49395399Hn6953o