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: 9, 15, ['5019', '7519', '2791', 'u', '9851', 'F', 'N', '9569', 'b', 'X', '519', '1669', 'D', '8559', 'm', 'K', 'z', 'K']

m8559D1669519Xb