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:
5, 6, ['7565', '6525', '7421', 'u', '303', '1815', '273', '6725', 'i']
answer:
5181303


question:
7, 12, ['4563', '7657', '4657', '1145', 'A', 'e', 'a', '5429', '3323', 'I', '569', 'R', '5013', 'U', 'v', 'l', 'h', 'z', 'e', 'D', 'n', 'h', 'h', '4673', '973']
answer:
R965I32339245a


question:
2, 4, ['L', '9357', '1643', 'Y', '227', '393', 'g', 'F', '3011', 'D', '4059', 'F', '2755', '2749', 'u', 'Y', '5343', 'D', 'V']
answer:

Y34617539