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: 7, 18, ['u', 'y', '3487', 'W', '7609', '4319', '1719', '105', '7881', '2789', '3581', 'y', '7171', 'T', '5773', 'Q', 'd', '8851', '9245', '4479']

8851dQ5773T7171y3581278978811051719