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]: 8, 21, ['7449', 'R', '469', 'm', 'A', '817', '9583', '239', 'n', '3597', 'C', '6853', '2745', '3827', '5775', 'x', '3875', '7503', '8903', '9679', '819']
[EX A]: 8199679890375033875x5775382727456853C3597n239

[EX Q]: 3, 4, ['1019', '7135', 'J', 'j', '6487', 'O', 'w', 'x']
[EX A]: jJ

[EX Q]: 7, 12, ['Z', '6077', '7409', '4793', 'R', 'x', '3827', '8703', '4691', 'Q', 'y', '2795', '4535', 't', '707', 's', 'I', 'p', '6575', 'q', '4593']
[EX A]:
2795yQ469187033827