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, 12, ['b', '8669', '8671', '8487', 'T', 'n', 'F', '611', 'A', '9399', '8449', '5409', 's', 'p', '6783', 'G', 'd', 'U', '7205']

86718487TnF611A939984495409