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: 5, 20, ['539', 'a', '4547', 'I', '3585', 'e', 'n', '9521', 'l', '7373', 'W', '7587', '7063', 'j', '4467', 'N', '3423', 'F', 'i', 'E']

EiF3423N4467j70637587W7373l9521ne3585