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, 4, ['I', 'i', 'b', '2703']
answer:
3072


question:
3, 4, ['435', 'K', '8051', '7159']
answer:
95171508


question:
2, 2, ['A', '2525', 'Y', 'x', 'I', 'K', '8387', '339', 'a', 'm', '6703', '4757', 'L', 'D', 'Q', '7729', '7713', 'm', 'K', 'h', 'I', 'n']
answer:

5252