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:
2, 12, ['W', 'R', 'P', '9411', '179', '5175', '7959', 'o', '4285', 'H', '7535', '3423', 'Q', '7813', '611']
answer:
32435357H5824o959757159711149PR


question:
2, 3, ['X', '8243', '1209']
answer:
90213428


question:
6, 18, ['Z', '7617', 'k', '797', 'z', '5175', '3383', 'v', 'P', '5561', '1985', '3171', '9103', '4723', '267', '6963', '7137', 'R', '8725', '8113', '2461', '5935', 'H', '1095']
answer:

R7317369676232743019171358911655Pv38335715