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: 5, 19, ['6729', 'k', '8371', 's', '2953', 'u', 's', 'A', 'Y', 'g', '7231', '6765', 'g', '3729', 'e', 'u', 'o', '1227', 'a']

a1227oue3729g67657231gYAsu2953