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: 1, 21, ['6111', '3153', 'c', 'r', 'F', 'E', 'a', '2359', '2089', '2289', 's', 'R', '6575', '1529', '2415', '3421', '7117', 'U', '5087', '9261', '2693', '9777', 'u', 'k', '4721', 'x', '1543', 's']

61113153crFEa235920892289sR65751529241534217117U508792612693