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, 5, ['1803', 'T', 'u', '1089', '5655']
answer:
55659801


question:
6, 10, ['P', '6217', 'k', '761', 'L', 'r', '1897', '1503', '7353', '1055', '6661', 'p', 'p', '4313', 'i', 'P', '5081', '3723', 'x', '8455', 'D', 'l', '1379']
answer:
5501353730517981r


question:
10, 12, ['U', 'V', 'r', 's', 'L', '4427', '8191', 'Z', 'm', 'U', 'z', 'w', 'i', '5301', 'w', '7063', 'y', '7809']
answer:

wzU