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:
1, 4, ['t', '6037', 'I', '2769', 'C']
answer:
9672I7306t


question:
4, 4, ['u', 'Z', 'e', '253', '2663', 'q', '8421', '2509', '2831', 'H']
answer:
352


question:
16, 16, ['2035', 'S', 'R', '1967', '1887', '2851', '4445', 'v', 'G', 'P', 'G', 'E', 'A', '7535', 'P', '9739', '9031', '2489']
answer:

9379