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: 6, 15, ['R', '8017', 'J', 'q', 'Z', '8391', 'S', 'i', '9215', '213', 'p', 'Z', 'h', 'f', '7637', '1815']

8391Si9215213pZhf7637