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: 6, 21, ['6499', 'u', 'b', '7605', 'U', 'b', 'N', 'A', 'x', '6533', 'u', '217', '6619', '7499', '1665', '4059', '3253', '6337', 'Q', '6727', 'f', 'C', 'e', 's', 'g', '6071']

bNAx6533u217661974991665405932536337Q6727f