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: 19, 21, ['E', '2249', 'E', '9871', 'Z', 'n', 'R', '7307', 'B', 'P', 'G', '6577', 'y', 'm', '161', '8073', '6461', '333', '3033', 'u', 'b']

3033ub