In this task, you are given inputs i, j, and A, where i and j are integers and A is a list. You need to find all elements of A from the ith element to the jth element, reverse the order in which they occur, and then concatenate them to output the resultant 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 concatenate the elements and then reverse the string.

Ex Input:
3, 15, ['2345', 'c', 'B', '2961', '189', '2409', '3715', '6803', '3947', 'u', '7099', 'w', 'f', 'M', 'Q', '7533', 'm']

Ex Output:
QMfw7099u39476803371524091892961B


Ex Input:
2, 4, ['7887', 'x', '3749', 'N', 'U', '2971']

Ex Output:
N3749x


Ex Input:
15, 21, ['v', 't', '4437', '8433', 'e', '5355', 'R', 'm', 'g', 'z', 'g', '3967', 'I', '1939', '9819', 'O', '7669', 'Q', '2359', 'O', '8057', '777', '4517', 'F', 'v', '9421', 'e']

Ex Output:

8057O2359Q7669O9819