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.
7, 21, ['4205', '8291', 'g', '2915', 'q', '9267', 'H', 'w', '5623', '5109', 'H', 'V', '5445', 'W', 'y', 'q', 'R', '6013', '9177', '8845', 'A', '2383', 'k', 'q', '9603', '7449', 'm', '9537']