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: 3, 15, ['7727', 'a', '677', '4795', 'W', 'Y', 'U', '4911', '2369', 'P', 'L', '4465', '7359', '8593', 'K', 'O', '8855', 'y']

6774795WYU49112369PL446573598593K