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: 3, 7, ['3999', 'B', '407', '5631', '7965', '1765', '1263', '2527', 'C', '1513', '9979', '7451', '2073', '4657', '2039']

4075631796517651263