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: 3, 18, ['8727', 'o', 'r', '4243', '3919', '4483', '1257', '7763', 'w', 'T', '1213', 'b', '719', 'z', '3843', '7761', 'j', '8081', '3271', '8109', 'F', 'v']

8081j77613843z719b1213Tw77631257448339194243r