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: 12, 21, ['q', 'T', '8557', 'w', '1863', '1897', 'G', 'b', 'E', '7715', '2237', '3691', 'l', 'i', 'B', '1859', 'A', 'B', 'h', 'I', '3491', '8135', 's', 'm', 'M', '197', 'S']

3691liB1859ABhI3491