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, 15, ['J', 'o', 'C', '9901', '8459', 'L', 'W', 'T', '8773', '5331', 'U', '8277', 'c', 'w', '423']

LWT87735331U8277cw423