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:
8, 9, ['s', 'X', '6737', 'M', 'm', 'N', 'a', 'Q', 't']
answer:
tQ


question:
7, 13, ['F', 'n', '855', 'U', 'K', '3781', '8225', '961', '6991', '2345', '2961', 'T', 'R']
answer:

RT1692543219961695228