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:
7, 8, ['U', 't', '8289', '9391', '1751', 'Y', '9319', 'A', 'Q', 'd', 'B', '2521', '2455']
answer:
A9139


question:
3, 4, ['4887', 'N', 'y', '2813', 'C', 'J', 'v', '3199']
answer:
3182y


question:
4, 4, ['8923', 'y', '8095', '8945', '5017', '9191', '5123']
answer:

5498