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.
15, 18, ['p', '7927', 'v', '6273', '7365', '8819', 'I', '5603', '4283', 'B', '7753', 'R', '9381', 'P', 'B', '1849', 'x', 'm', 'l', '9375', 'e', 't', 'U', '8949', '367', 'q', 'V', '8071']