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: 2, 21, ['U', 'H', '3793', '6241', '2147', 'V', 'z', '5617', 'm', '1009', '9569', '8375', 'b', 'U', 'Y', 'D', '1187', '6245', '1549', '5725', '5815', '2595']

58155725154962451187DYUb837595691009m5617zV214762413793H