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, 14, ['r', '9203', '1229', 'w', 'p', 'O', '8177', 'r', 'L', '9221', '1247', '7645', '2557', 'W', 'R', '1967', '2031', 'R', '2545', '3449']

W2557764512479221Lr8177