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: 14, 20, ['6455', 'L', '3411', '9005', 'H', '991', 'd', 'q', '3731', '4749', 'G', 'r', '7431', 'R', 'M', 'J', '3787', 'j', '8319', '6441', '693', '5139', 'R', 'D', 'L', '8427']

64418319j3787JMR