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, ['1281', '3165', '5073', 'F', '9531', '3423', 'A', '4215', '4685', 'n', '1257', '4557', '9053', 'I', '1549', 'a', '2421', 'l', 'r', '5141', 'o', '4799', 'i', '6317', '1873', '93', 'o']