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, 21, ['d', 'C', 'D', '6929', 'E', '4367', 'Y', '3555', '671', '731', 'S', 'z', '4327', '8119', '5947', '2699', '2643', 'C', '7585', 'F', 't', '4123']

3555671731Sz43278119594726992643C7585Ft