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, 18, ['z', 'A', 'v', 'E', 'U', 'C', 'V', 'h', 'r', '3605', 'Y', '8793', '2873', 'Y', '8227', '2063', '2777', '7721', '9249', 'V', '9985']

7721277720638227Y28738793Y3605rhV