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: 11, 20, ['Y', 'r', 'U', '4453', 'W', 'b', '2363', '2303', '1767', 'A', '2119', '6421', 'e', 'B', 'Y', '2169', '7155', 'i', 'Q', '4049']

21196421eBY21697155iQ4049