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:
19, 20, ['w', '4131', 'C', '719', '2961', 'Q', '4167', '1001', 'p', '965', '1153', '6881', '3361', 'H', 'f', 'V', '9393', 'x', '6091', 'B', '6757', 'U', '2619', '5649', '6447', 'D']
answer:
B1906


question:
22, 26, ['O', '9947', '2663', '8883', 'o', '1499', 'u', 'n', 's', 'k', '4637', 'e', 'G', '8807', '6975', '3263', '4157', '8213', '5235', 'H', '4915', '7443', 'i', 'h', 'j', '6837', '983', '8793']
answer:
7386jhi3447


question:
9, 19, ['1975', '251', '8357', '4235', 'f', 'n', 'O', '539', 'I', '6249', '9869', 'j', 'M', '7697', '1273', 'v', '8169', 'g', 'x', 'S', 'O', '299', '8781', 'L', '4161', '3955', 'U', '6671', '1155']
answer:

xg9618v37217967Mj96899426I