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, 1, ['f', 'E', 'G', '9657']
answer:
f


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:
7, 25, ['m', '2015', 'M', '5693', '6175', '4757', 't', '4353', 'N', 'Y', 'Y', 'q', 't', 'K', 'H', '9625', 'm', '5239', 'l', '2509', 'D', '7435', '7351', '9447', 'L', '1031', 'J', 'I']
answer:

L744915375347D9052l9325m5269HKtqYYN3534t