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: 2, 20, ['r', 'f', 'G', 'C', 'b', 'L', 'g', 'z', 'n', 'z', '6291', '721', 'O', 'F', '1737', 'j', '1327', '6407', 'b', '5817', '9741', '1721', '6771', '1145', 'B', '7273', '4767', 'f', 'd']

5817b64071327j1737FO7216291znzgLbCGf