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: 10, 19, ['X', '6431', 'x', 'C', 'L', '8197', '5031', 'L', 'u', '8643', 'U', 'D', 'w', '2359', 'w', 'z', 'a', 'b', '5571', 'O', '5503', '5291']

8643UDw2359wzab5571