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: 5, 16, ['l', 'V', 'c', '621', 'r', 'x', 'b', 'E', 'C', 'b', '3859', 'b', '2393', '7399', '6145', '8423', '8671', 'O', '9475']

8423614573992393b3859bCEbxr