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: 14, 18, ['3649', 'm', '4381', 'B', 'k', 'Y', '8439', 'i', 'D', '8949', '21', 'O', 'u', 'O', 'E', 'W', 'L', '4905', '3877']

4905LWEO