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, 15, ['o', '4391', 'b', 'H', 'g', 'O', 'N', 'm', 'B', 'P', 'w', 'u', '2679', 'c', 'p', 'U', '2121', '1029', 'q', 'n', 'C', '2869']

pc2679uwPBmN