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: 6, 20, ['7681', '2651', 'r', 'C', '3097', '5885', '2427', 'U', '4805', '9199', '6823', '7851', '7949', 'r', '7855', '3707', 's', 'S', '4443', 'H', '3343', 'y', 'J', 'p', 'K', '7345']

H4443Ss37077855r79497851682391994805U24275885