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: 21, 21, ['2419', 'm', '289', 'g', 's', 'U', '8461', 'q', '3177', 'J', '3877', 'w', 'b', '4411', '9161', '7461', 'y', '8151', 'v', '4145', 'B', 'D', 'X', '7763', '143']

B