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: 9, 21, ['9235', '9133', '8727', '3683', 'D', 'x', 'S', 'c', '7749', 'X', '6521', '2485', '3895', '6941', 'B', 'W', 'u', 'B', '1289', 'J', 'X']

7749X6521248538956941BWuB1289JX