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.
2, 20, ['6585', 'c', '6207', 'l', 'F', '909', 'v', 'r', 'a', 'r', 'i', 'G', '9797', '6767', 'A', '719', '4317', '5283', '1569', '2629', '5749', 'g', 'n', '6571', '4139', '797']