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: 6, 18, ['x', 'm', 'z', '4399', 'p', 'R', 'U', 'f', 'd', 'Z', 'G', 'a', 'p', '6237', '451', '1091', 'C', 'd']

RUfdZGap62374511091Cd