instruction:
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.
question:
4, 7, ['3421', '6129', '593', '203', '2731', '1393', '9739', '1087', '3453', '1389', 'W', 'D', 'b', '9261']
answer:
937939311372302


question:
4, 19, ['I', 'h', 'D', 'd', 'e', 'X', 'h', '2821', 'y', '2537', '2345', 't', 'I', 'i', 'D', '543', '2469', 'j', 'V', 'U', '8523', '605', 'J', '6675', '8559', 'n']
answer:
Vj9642345DiIt54327352y1282hXed


question:
5, 19, ['5563', '3373', '2353', 'z', '5235', 'f', 'J', 'Z', '2443', 'o', 'i', 'i', 'u', 'P', '1419', '9387', 'Y', '5899', 'R', '9151', '5059', '3259', '8933', 'Y', 'f', 'y', 'U']
answer:

R9985Y78399141Puiio3442ZJf5325