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.
4, 20, ['Z', '3791', '8651', 'T', '8379', 'o', 'G', '6357', '5783', 'V', 'L', 'c', '457', '2369', '459', 's', '2827', '9467', 'i', 'B']