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: 18, 21, ['k', 'T', '1235', 'r', 'Y', 'M', '4935', '281', '189', '2741', '1963', '4093', '8631', '3809', '7659', '2767', '2791', 's', 'C', '5545', 'B', 'J', '3041', 'u', '6029', 'K', '3935']

sC5545B