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, 21, ['M', 'C', '7257', '5909', '6247', 'B', '3941', 'o', '4695', 'v', '5033', '6439', 'z', '9865', '8685', '9915', '2865', '5899', '2491', 'i', 'y', 'q', '7381']

6247B3941o4695v50336439z986586859915286558992491iy