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: 8, 18, ['C', '1853', 'k', '2335', '1843', '5841', '3941', 'Y', 'L', 'L', 'b', '6403', '2749', 'T', 'U', '6195', 'f', '4269', '5765', 'B', 'b', '5857']

YLLb64032749TU6195f4269