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: 15, 20, ['N', '9399', 'a', 'L', '8439', 'S', '2003', '1551', '2151', 'g', 'L', '1047', '6543', '6825', '5431', 'o', '9167', 'x', 'y', '3017', '6687', 'U', 'Y', 'g']

5431o9167xy3017