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, ['n', '6523', 'z', 'x', 'L', '4607', '1145', 'P', '109', 'n', 'q', '5319', '7549', '7107', 'c', 'g', 'v', 'W', '4955']

4955Wvgc710775495319