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.

2, 4, ['7887', 'x', '3749', 'N', 'U', '2971']
N3749x

2, 3, ['D', '373', '8515', 'G', 'G', 'c']
8515373

6, 10, ['K', '3869', 'f', '8723', 'E', 'R', '2799', 'P', '3935', '9171', '9285', 'm', 'Y', '7103', '7399', '8385']

91713935P2799R