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, 20, ['e', 'x', '5541', 'D', '2241', '5507', '2225', '6871', 'l', 'f', 'K', 'C', '1787', 'v', 's', 'a', '5349', 't', '7069', 'a', 'J', 'k', '9879', '7389', '4775', '7257']

a7069t5349asv1787CKfl6871222555072241