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: 11, 21, ['9615', '7645', 'Y', 'i', '1521', 'a', '851', 'A', 'K', '8085', 'B', 'u', 'a', 'L', '8907', '7269', 'v', 'D', 'x', '2757', 'D', '8567', 'L', '7869', '7813', '4499']

D2757xDv72698907LauB