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: 7, 18, ['669', '8861', '3045', '3013', '6449', '3433', 'N', 'k', 'Q', 'L', '7123', 'N', '6073', 'f', '5617', '1443', '9051', 'f', '4523', 'e', 'F']

f905114435617f6073N7123LQkN