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:
1, 15, ['5997', '2005', '8529', 'j', 'T', '9729', 'T', 'm', '357', '779', '2253', '725', 'z', '4149', '2913', '8135', 'Q', 'B']
answer:
31929414z5273522977753mT9279Tj925850027995


question:
4, 4, ['w', '3895', '4989', '7875', 'u']
answer:
5787


question:
12, 19, ['2423', '1927', '1837', 'L', '823', '761', '8883', '4721', 'v', '867', '4911', '7479', '2605', 'a', 'Y', 'e', 'h', '1081', 'h', 'G', '3921', '2283', '3447', 'q']
answer:

h1801heYa50629747