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: 15, 18, ['8643', 'x', 'j', 'G', '9745', '4989', '4217', 'c', 'p', 'z', 'K', 'F', 'm', 'a', '5879', '251', 'P', 'S', 'S', 'k']

5879251PS