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.
18, 20, ['c', '8973', 'z', '2213', '5571', 'm', 'H', '2955', 'E', '1969', 't', '8293', '2185', 'i', '5241', '1291', '8367', 'T', '1845', 's', '4099', 'H', '2459', '6503', '3569', 'i']