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, 7, ['1247', 's', 'J', 'w', 'X', '7211', 'c']
answer:
c1127Xw


question:
2, 2, ['9085', '5983', '3197', 'C']
answer:
3895


question:
7, 17, ['m', 'H', '15', '5151', 'X', 'B', '3467', '2523', 's', '1885', 'r', '2011', 'z', '7409', 'L', 'C', '531', 's', '6631', 'c']
answer:

135CL9047z1102r5881s32527643