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, 7, ['1247', 's', 'J', 'w', 'X', '7211', 'c']
answer:
c1127Xw


question:
4, 14, ['Y', '3111', 'M', 'N', 'l', '721', 'j', '997', 'e', '353', 'd', '167', '5485', 'C', '745', 'x', 'k', '7269', '5835', 'F', 'D', 'Y', 'a', '117']
answer:
C5845761d353e799j127lN


question:
3, 3, ['u', '2253', 'f']
answer:

f