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.
19, 20, ['Y', '1305', 'Z', 'T', 'y', 'F', 'V', '5571', 'E', 'D', '5841', '1935', '3247', 'A', '2385', 'n', '8743', '8483', '4319', 'j', 'b', 'g', '5423']