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.
9, 19, ['1975', '251', '8357', '4235', 'f', 'n', 'O', '539', 'I', '6249', '9869', 'j', 'M', '7697', '1273', 'v', '8169', 'g', 'x', 'S', 'O', '299', '8781', 'L', '4161', '3955', 'U', '6671', '1155']