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:
5, 7, ['u', '3017', '4149', 'z', '9231', 'C', '7461', 'e']
answer:
1647C1329


question:
2, 5, ['1987', '3507', '839', '3509', '9857', 'V', '9987', 'g', 'G', '7295', 'v', 'b', 'o', 'Q', 'Q', 'x', '3295', '9917', 'R', '221']
answer:
758990539387053


question:
10, 11, ['C', 'O', '9693', 'W', 'k', 'I', 'b', 'b', '8743', 'X', 'j', '961', '4525', 'D', '9703']
answer:

jX