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, 9, ['7341', 'm', '1607', 'U', 'S', 'N', 'v', '3363', 'U', 'b', '9121', 'U', '6397', '9355', '3557', '4773', '6345', '4381', '8867', '6649']

U3363vNSU1607