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, 3, ['2047', 'R', '6885', '1243', 'Z']
answer:
5886


question:
2, 2, ['9085', '5983', '3197', 'C']
answer:
3895


question:
3, 6, ['q', 'v', '3345', '1757', '4037', 'Z', 'O', '4903', '1389', '843', 'T', 'w', '1721', 'Q', '8499']
answer:

Z730475715433