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: 18, 19, ['o', 'L', 'M', 'J', '3837', 'Q', '2447', 'c', 'r', 't', '1259', 'b', 't', 's', '5991', '5505', '7573', '6591', '815', '4117', 'd']

8156591