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: 17, 21, ['d', 'm', '3859', 'v', '2647', '4039', '5519', 'Y', 'R', '5041', 'Z', 'G', '7221', 'n', '4271', 'V', '749', '8553', 'q', 'D', 'u', 'U', 'E', '9803']

uDq8553749