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, 21, ['b', 'H', 'P', '4381', 'E', '9053', '7253', '9597', '8035', 'I', '8685', '2715', '4205', 'm', '143', '3023', '5681', '5599', 'G', '1737', '5129', 'w', 'a', '4827', 'W', 'Z', '2167', 'V']