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: 4, 8, ['R', 'D', 'x', 't', '6721', 'w', 'V', 'v', '6427', 'L', '2487', 'W', '7339', '9515', 'a', 'I', 'E', '3897', '4869']

t6721wVv