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.
5, 18, ['1257', '3745', 's', 'G', '8589', 'I', '9449', 'T', '4763', '4033', 'b', '6003', '1939', '4345', '5115', 'W', '631', '707', 'K', 'n', 'M', '9959', 'g', 'y', 'u', 'j']