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, 18, ['h', '1831', 'I', 'e', '969', '5431', 's', 'B', 'J', '6887', 'O', '1701', 'R', 'V', '1135', '9667', '2017', 'B', '5697', 'N', '7907', '7355', 'o', 'K', '3619', 'c', 'C']