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 Q]: 1, 4, ['s', 'n', '6721', 'W', 'H']
[EX A]: W6721ns

[EX Q]: 16, 20, ['D', 'N', 'r', 'F', 'G', 'p', '4865', 'c', '7743', '6781', '8771', 'o', 's', '2061', '8445', 'O', 't', 'y', 'n', 'p', '5101']
[EX A]: pnytO

[EX Q]: 1, 2, ['O', 'E', 'f', 'J', '1709', '9297', 'q', '5655', '1435', '5215', '4045', '9895', '5061', '3347', '9489', 'u', '6395', 'K', 'A', 'L', '289', 'v', 'b']
[EX A]:
EO