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, 12, ['9669', 'v', '8425', '585', '623', 'T', '4431', 'U', '399', 'r', 'I', 'F', 'X', '9403', '5719', 'R', '2633', 'k']

U399rIF