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, 25, ['B', 'x', '3509', 'c', '4425', 'n', '8513', 'x', 'W', '7995', 'H', 'O', 'w', 'e', '569', '3531', 'u', '3915', '6315', '1597', 'U', '77', 'C', 'V', 'L', '1787', '3839', 'C']