Definition: 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.
Input: 2, 18, ['2779', '7113', 'b', 'a', '443', '5941', 'B', '231', '6457', '3559', 'D', '5427', '5507', 'L', 'O', 'R', 'b', 'H', 'c', 'Y', '9921', '1163', 'Q']

HbROL55075427D35596457231B5941443ab7113