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: 1, 5, ['8419', '9975', 't', 'x', '7869', 'd', '6515', '4873', '4519', '899', 'Z', 'X', 'l', 'r', '743', 'N', 'a', '4231', 'W', 'm', '3517', '7539']

7869xt99758419