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:
6, 7, ['2289', '1015', 'T', 'e', '4499', 'J', 'B', '5107', 'x', '3103', 'Q', 'Z', 'H']
answer:
BJ


question:
10, 10, ['7719', 'K', '7323', '7843', '7079', 'y', '6777', 'M', 'S', 'v', 's', '4857', 'J', '8269', 'm']
answer:
v


question:
9, 12, ['a', 'C', 'c', '3213', '3651', 's', '3533', 'Y', 'k', 'v', 'P', '3901', '4905']
answer:

1093Pvk