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: 1, 16, ['n', '6899', 'E', 'O', 'U', '5675', 'M', '7785', 'z', 'g', 'P', 'A', 'a', '7617', 'A', '2071', 'k', '8721', '6675', '9853', 'Q', 'B']

n6899EOU5675M7785zgPAa7617A2071