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: 3, 12, ['5817', 't', 'i', 's', 'L', 'S', '2455', '947', 'K', '7603', '8661', '5417', '9375', '1945', 'U', 'C', '6597', '9359', 'w']

541786617603K9472455SLsi