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: 2, 15, ['J', 'e', 'f', 'B', 'j', '7319', 'o', 'O', '3981', 's', '1249', '9693', 'u', 'e', '6181', '3909', 'u']

efBj7319oO3981s12499693ue6181