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: 9, 20, ['R', '4973', 'Y', '3731', 'D', 'B', 'V', '7131', '1617', 'S', '9789', 'u', 'I', '9543', '3025', 'H', '6159', 'U', '4341', '1161', '5099', '3335', 'L', '4299', '251']

11614341U6159H30259543Iu9789S1617