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: 2, 17, ['g', '3091', 'J', 'i', '3509', 'C', 'b', '9007', '8387', 'r', 'U', '5123', '9769', 'P', '9287', '6705', '4211', '3615', '4523', 'I', '6615']

3091Ji3509Cb90078387rU51239769P928767054211