In this task, you are given inputs 'i', 'j', and A, where 'i' and 'j' are integers and A is a list. A list is shown by two brackets and comma-separated numbers and characters inside, like ['1', '12', 'l']. You need to concatenate all elements of A from the ith element to the jth element, and then reverse the resulting 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 reverse first and then concatenate.

6, 6, ['x', 'o', '4399', '1001', '9267', 'U', 'r', 'e', '6415', '3811', '5385', 'v', 'E', 'q', '6033', 'm', 'i', 'O', 'W', 'R', '4017', 'I', 'T', 'D', '1349', '7213', '9619']
U

17, 18, ['1795', '6295', '9741', '1375', '8077', 'y', '6465', 'q', '889', 'E', 'N', 'S', '6665', 'H', '2343', 'J', '3369', '5475', 'e', '9991', 'B', 'E', '2317', 'a', 'T', '7337', 'G', '2469', 'D']
57459633

11, 12, ['t', 'u', '7091', 'U', '4651', '7855', '9835', '3763', 'W', 'M', '3099', '5703', 'q', '2003', 'Q', '1777', 'y', 'Z', '4743', '8809', '3957']

30759903