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: 11, 20, ['W', 'D', 'U', '7803', '7827', '4949', 'U', 'm', 'r', 'h', '987', '3909', 'd', 'm', '5569', 'j', '881', 'd', '8399', 'Y', '9377', 'h', 'l', '6327']

9873909dm5569j881d8399Y