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, ['139', '6393', '9399', 'Q', 'h', '7173', 'F', 'z', '9825', '4465', '137', '9269', 'i', 'R', '2349', 'b', 'n', 'R', 'Q', 's', 'E', 'q', '9083']

QRnb2349Ri9269