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: 20, 21, ['7067', 'i', 'D', '7869', 'w', 'o', 'm', 'q', '4461', '2899', 'h', 'Z', 'h', '1927', 'G', 'o', 'c', '8729', 'M', '4385', '8261', 'f', '2789', 'Q']

43858261