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: 7, 21, ['921', '5199', '6581', 'Y', '8867', '6157', '5997', '8579', '9173', 'w', '4853', 'W', '6721', '3529', 'f', 'o', '1519', '9833', '61', 's', 'g', 'a', '8863', 'T', 'S', 'f', '8955']

599785799173w4853W67213529fo1519983361sg