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:
15, 19, ['s', '2569', '1713', 't', 'R', 'G', '5779', 'o', '2667', 'W', '9283', '2419', '6745', 'f', 's', '4131', '8337', 'q', '5275', 'Y', 'N', 'k', 'K', '1937', '3983', '759', '471', 'J', '3213']
answer:
5725q73381314s


question:
5, 7, ['u', '3017', '4149', 'z', '9231', 'C', '7461', 'e']
answer:
1647C1329


question:
3, 4, ['w', '7981', 'h', 'M', '6469']
answer:

Mh