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, 18, ['Y', 's', 'A', 'R', 'A', '2811', 'J', 'u', 'R', 'g', '5921', 'B', 'U', '4637', 'n', '1607', 'z', 'Z', 'K', '3475', '8499', '3585', '163', 'w', 'c', 'q', 'X']

2811JuRg5921BU4637n1607zZ