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: 10, 20, ['5699', 'r', '2701', '2563', 'H', 'I', 'W', 'e', '7517', 's', 'Q', '1095', 'o', 'g', 'c', '4877', 'H', 'W', '6717', 'z', 'g', 'J', 'L', '5213', '6267', '2189', '8709']

z6717WH4877cgo1095Qs