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, 8, ['9889', 'z', '895', 'W', 'j', 'K', '7047', '9723', '6281']
answer:
32797407Kj


question:
4, 13, ['9747', 'g', 'z', 'I', 'a', '8619', '6035', '4209', 'M', '5157', 'J', '2399', '3935', 'e', '531', '9759', '4253', '7311', 'G', '4751', '3589']
answer:
53939932J7515M902453069168aI


question:
16, 21, ['e', '5725', 'B', '8981', 'P', '4437', '4419', 'w', 's', 'W', '6475', '7247', '4903', 'd', '3711', '1181', 'C', 'i', 'x', 'W', 'X', '349', 'a', '7347', 'y', '951', 'J', '1591']
answer:

XWxiC1811