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, 6, ['6855', 'b', '7991', 'w', 'W', 'L', '2625', '19', 'L', 'r', '8233', 'X', '5475', '5973', '6795', '6197', 'H', 'u', 'P', 'f', '8435']