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, 9, ['3207', 'E', 'h', 'h', 'I', '4019', 'v', 'O', 'r', 'Q', '9685', 'I', '8665', '7037', '5181', 'v', 'W', 'a', 'p', '2959', 'f', 'H', '3121']
answer:
rOv9104IhhE7023


question:
1, 4, ['63', '5429', '5563', '2045', '875', '7163', '1869']
answer:
54023655924536


question:
7, 9, ['1869', 'o', 'A', '9407', 'T', 't', 'p', '1281', '3843', '8403', 'i', 'n', 'U']
answer:

34831821p