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, 21, ['g', 'j', 'P', '6037', 'b', 'L', '9591', '3529', '6867', '3583', 'o', 'C', '7303', 'z', '8443', '6177', '7275', '723', 'R', 'q', '2007', '7597', '4611', 't', 'P']