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: 12, 19, ['L', 'm', 'v', 'G', 'y', 'D', 'a', 'D', '7569', 'x', '8621', 'O', 'Y', '7973', '2083', 'u', '6341', '131', 'r', 'Y', 'p', 'b', 'J', 'n', '1649', 'u', 'L', 'e', '4807']

r1316341u20837973YO