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, 13, ['469', '2079', 'r', '3969', '9143', 'K', 'U', 'w', 'U', 'b', 'N', '8587', '7767', 'f']

wUbN85877767