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 concatenate all elements of A from the ith element to the jth element, and print 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.
Input: 6, 8, ['U', 'E', '8087', 'B', 'L', '8207', '9233', '9713', 'b', 'O', 'v', 'a', '8973', '7507', '8047']

820792339713