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: 6, 12, ['9381', 'k', 'W', 's', '3711', 'M', '6345', '6103', 'R', 'm', 'a', 'w', '4021', '2417', '4451', '7931', 'N', '5313', 'L']

wamR61036345M