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.
10, 16, ['7031', 'Y', '1841', 'W', 'x', '4791', '1815', 'A', '9709', '4723', 'u', 'n', '3621', 'r', '6959', '5265', 'o', '3733', '7121', '7049']