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, 2, ['U', 'G', 'N']
[EX A]: GU

[EX Q]: 3, 7, ['973', '4113', '517', '6021', '6051', 'H', '3763', 'S', '6425', 'G', '5913', 'U', '1421']
[EX A]: 3763H60516021517

[EX Q]: 7, 21, ['D', '4567', 'P', '1629', '5717', 'L', '3493', 'g', '5449', 'P', 'Q', '3391', 'C', '5249', '4575', '4519', 'b', '6749', '9551', '7327', '8281']
[EX A]:
8281732795516749b451945755249C3391QP5449g3493