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: 2, 21, ['U', 'w', 'S', '2515', 'x', '1065', 'P', 'h', '4307', 'E', '7533', 'T', '9905', '2697', 'l', 'T', '2955', 's', 'x', '1935', '2749', 'h', 'v', 'g']

27491935xs2955Tl26979905T7533E4307hP1065x2515Sw