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, 22, ['y', 'R', 'y', 'N', 'n', 'C', 'b', 'l', '7663', '9529', '5449', '4387', '8237', '5913', 'H', 'g', 'H', 'm', 'J', 'P', 'G', 'K']

PGK