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: 5, 18, ['2175', '2991', '7831', '4565', '2127', 'y', 'a', '3899', 'H', 'r', 'I', 'd', '4631', 'p', 'q', 'm', 'd', 'U']

2127ya3899HrId4631pqmdU