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, 3, ['u', 'D', '6391']
[EX A]: 6391Du

[EX Q]: 11, 15, ['Y', 'L', 'I', 'u', 'z', '4077', 'K', '4679', 'l', '9269', '4071', '1789', 'b', '2139', 'b', '111', '6715', 'H', '3981']
[EX A]: b2139b17894071

[EX Q]: 14, 21, ['9837', '8221', 'a', '4283', 'w', 'M', '8583', 'H', 'q', '5159', 'o', 'e', '5801', '4061', '7371', '1093', '2269', '9813', '8987', '7195', 'B', 'y', 'n', '7427', 'N']
[EX A]:
B7195898798132269109373714061