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: 4, 21, ['6247', '259', '291', '7113', '7235', 'L', '1499', '8713', '1183', '9003', '9573', '6419', '2553', '1069', '1723', '799', 'J', 'N', '245', 'r', 'M', '5219', 'Z', '7329']

Mr245NJ799172310692553641995739003118387131499L72357113