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: 18, 21, ['9479', '2917', '8123', '7389', 'L', 'H', '2187', 'J', '9519', '3553', '6873', '4177', 'c', '5393', '1611', 'Y', 'u', '5729', 'y', '8069', '6955', 'K', 'a', 'n', '6749', 'y', 'Z', '5327']

5729y80696955