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: 18, 22, ['n', '9171', '5869', '8843', 'h', '7987', 'c', 'W', '2803', '4117', 'q', 'B', '845', '2193', 'm', '2639', 'Z', 'X', 'L', 'B', '6351', 's', '9981', 'M']

s6351BLX