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, 12, ['M', 'Q', '303', '6949', 'Q', '9883', 'A', 'n', 'U', '9005', '8685', 'g', 'n', '6367']

g86859005UnA9883Q