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: 8, 20, ['1501', 'Q', '4319', 'Z', 'b', 'S', 'A', 'r', '7149', 'q', 'g', 'k', 'b', '6351', '9237', '2909', 'f', '6865', 'v', '1215', '49', '5545', 'C', '4993', '6157', 'C', 'w', 'E', 'a', 'W']

r7149qgkb635192372909f6865v1215