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: 5, 18, ['7219', '7083', '5199', '4235', 'C', 'U', '5947', 'c', 'A', 'q', 'B', '2493', '9719', '8663', 'b', 'Q', 'U', 'k', '2559', 'n', 'B', '4091', 'q', '9935']

kUQb866397192493BqAc5947UC