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: 3, 21, ['E', '8623', '9395', '5057', 't', '2047', 'C', '9991', 't', '6291', '8351', '135', '1121', '9849', 'U', 'k', 'A', '9783', 'B', '9519', 'D', '8207', 'J', '2747', '9385', 'X', 't']

93955057t2047C9991t6291835113511219849UkA9783B9519D