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:
4, 4, ['339', '1345', '9749', '6877', 'b', 'K', 'f', '1443']
answer:
7786


question:
8, 15, ['l', 'p', '7691', 'q', '5663', '41', 'P', '2779', '7265', 'V', '4931', '8979', 'l', 'l', 'l', '45', '1245', 'F', '1139', '3531', '5337', '369', 'g', 'Q']
answer:
lll97981394V56279772


question:
8, 19, ['9769', '6157', 'M', '8097', 's', '4803', 'P', 'I', '1493', 'Y', 'z', '4283', '69', 'O', 'Y', '5957', '6911', '3005', 'Q', 'V', '7201', '4813', '1997', '7055']
answer:

Q500311967595YO963824zY3941I