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, ['7201', '6357', '2525', 'Z', 'u', 'w', '3349', '4977', 'D', '3617', 'M', '7621', '947', '7525', 'Y', '1617', '145', '807', '3675', '3355', 'a', '1679']

uw33494977D3617M76219477525Y161714580736753355a