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, 21, ['7969', '6923', 'z', 'u', 'J', '897', 'X', 'z', 'Z', '8349', 'R', '6195', '5997', 'e', 'B', '6869', '6805', '6759', '4843', '5145', 'G', '5771', 'W', '8439', '3487', '4401', '3371', '5965']

897XzZ8349R61955997eB68696805675948435145G