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: 4, 12, ['8903', '2515', '1949', 'W', 'T', 'Q', '393', 'Z', '6669', '9777', '8057', 'l']

WTQ393Z666997778057l