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: 16, 18, ['E', 'T', 'x', '6909', '2741', '5351', '9437', '7251', '7637', 't', '3021', '6705', '8449', '2149', '6669', '7439', 'Y', '4089', 'k']

7439Y4089