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, 20, ['x', '2685', 'b', '3077', 'n', 'j', 'o', 'i', 'F', '5719', 'y', 'B', 'L', '7415', '875', 'C', '3031', 's', '105', '2185']

joiF5719yBL7415875C3031s1052185