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: 19, 20, ['t', '4917', 'u', '3689', '9807', '8181', 'v', 'D', '6421', '3753', '3475', '133', 'N', 'Y', '4943', '6451', '8471', '6667', 'Y', '199', 'Z', 'j']

199Y