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, 5, ['f', 'd', '2691', 't', 'u']
answer:
ut1962d


question:
5, 7, ['2725', '1489', 'P', '2021', 'c', '1605', 'R', 'T', 'p', 'q', '6487', '3395', 'u', 'x']
answer:
R5061c


question:
5, 14, ['W', 'Y', 'u', 'l', 'R', 's', '7909', 'j', 'G', 'Q', '8023', '699', 'F', 'O']
answer:

OF9963208QGj9097sR