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, 19, ['9409', 'U', 'i', '5801', '5147', 'J', '7039', '9011', '2467', 'R', '6013', '2085', '5303', '8701', '8509', '3885', 'U', '8087', 'r', '8197', 'J', 'i', '2979']