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: 11, 15, ['U', 'q', '5235', 'C', 'x', 'M', 'K', '4911', 'U', '9591', 'R', '3243', '371', '6771', 'I', '4235', 'O', 'O', '5053', 'q', '77']

I67713713243R