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: 14, 21, ['y', '9743', 'N', 'c', '9967', '1009', 'z', 'i', 'u', 'B', '2765', '699', 'H', '8469', 'D', 'c', '8883', 'W', '7607', '1955', '3877']

8469Dc8883W760719553877