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: 20, 28, ['g', '2807', 'H', '4777', '2085', 'M', '9267', '731', 'r', '7455', 'D', '3943', 'Z', 'i', 'X', 'W', '2837', '9833', 's', 'a', '253', 'd', '8017', 'j', 'u', '3683', '8779', 'x']

a253d8017ju36838779x