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: 17, 21, ['k', 'n', '9399', '1517', '3231', 'h', 'p', 'S', '3419', 'T', '3077', 'W', 'J', 'Q', '6467', 'f', '5381', '2083', 'w', '7943', '7143', 'k']

53812083w79437143