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: 17, 21, ['i', 'j', 'u', '9649', '5393', '1651', '3609', 'n', '1367', '7999', 'o', 't', '2651', 'S', 'k', '9973', '8921', '1929', '4525', '6081', 'M', '6857', 'p', '9023', '311', 'k']

8921192945256081M