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:
3, 4, ['2419', '643', '8177', '7291', '561', '6529', '4101', 'u', '6445']
answer:
19277718


question:
2, 27, ['d', 'L', 'o', '3417', 'J', '2183', '8813', '2469', '3583', '8225', 'o', 'q', 'N', '3215', 'V', 'f', '7371', 'F', '6797', 'R', 'X', '2245', 'P', 'v', '4347', 'k', 'K', 'O']
answer:
Kk7434vP5422XR7976F1737fV5123Nqo52283853964231883812J7143oL


question:
4, 4, ['Z', '8457', '1751', '7497', '5503', 'r', '4833', '5143']
answer:

7947