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:
9, 18, ['k', 'p', 'h', 'h', '23', 'j', 'H', '8681', 'P', 'c', '8375', '4243', '8007', 'z', '2155', '9641', 'J', 'k', 'Z']
answer:
kJ14695512z700834245738cP


question:
6, 6, ['x', 'o', '4399', '1001', '9267', 'U', 'r', 'e', '6415', '3811', '5385', 'v', 'E', 'q', '6033', 'm', 'i', 'O', 'W', 'R', '4017', 'I', 'T', 'D', '1349', '7213', '9619']
answer:
U


question:
4, 6, ['6731', 'd', '2771', 'd', '6283', '6201', 'h', 'B', '9585', '4507', '2517', 's', '3651', '4029', 'k', '5133', '947']
answer:

10263826d