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:
1, 3, ['Y', 'k', 'P', '1517', 'z', '8727', 'U']

Ex Output:
PkY


Ex Input:
1, 1, ['P', '9387', 'r', 'I', '8965', 'J', '7595', 'W', 'n', 'C', 'y', '1877', 'b', 'Z']

Ex Output:
P


Ex Input:
12, 12, ['t', '5421', 'n', 'O', 'f', '9509', '4403', 'O', '9323', 'a', 's', 'B']

Ex Output:

B