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: 18, 21, ['1317', 'f', 'e', 'P', 'W', '9827', 'k', 'Z', 'n', 'P', 's', 'L', '3991', '9543', '9433', 'Z', '449', 'v', '8233', 'f', '8217', '8493', '1343', 'U', 'J', '7069', '7397', '9799']

v8233f8217