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: 4, 15, ['i', 'r', '687', 'u', '3995', '2391', 'E', 'g', 't', '1709', 'H', 'i', 'T', 'U', 'C', 'Z', '4677', 'm']

u39952391Egt1709HiTUC