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: 2, 19, ['t', 's', 'Z', '6665', '1401', 'z', 't', 'i', '1815', '3619', 'P', '6275', 'U', '8513', '1985', '9389', 'E', 'B', '3021', '7693']

3021BE938919858513U6275P36191815itz14016665Zs