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: 12, 25, ['K', 's', '855', 'x', 'K', '6783', '3553', 'J', '7491', '6687', '7637', '4101', 'L', '6669', '4317', '6925', '6149', 'U', '2647', 'D', 'd', '1825', 'M', 'A', '9001', 'd', 'E']

9001AM1825dD2647U6149692543176669L4101