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, ['X', '4385', 'u', '215', '7569', 'd', '675', '9079', '3709', 's', 'P', 'd', 'q', '3719', 's', 'c', 'F', '8509', 'Y', '7677', 'a', 'H', '751', 'n', '4191', '8701']

8509Fcs3719qdPs37099079675