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: 7, 12, ['Z', '4091', '307', '823', '2485', 'v', 'r', '7301', 'q', 'S', '3553', 'U', '3359', 'b', '5969', 'h', '8153', '5949', '4001', 'v', '5601', '7815', '6049']

U3553Sq7301r