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: 13, 21, ['6987', 'C', '3491', 'n', 'E', '1715', '3971', '4153', 'R', '6087', 'd', 'i', 'd', 'l', '7039', '3155', '4539', 'w', 'm', 'M', 'X', 'J', '9747', 'b', 'W', 'L', 'l']

dl703931554539wmMX