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: 7, 12, ['3673', '2759', '8113', 'Y', '2129', '5597', '6439', 'Z', '9479', 'r', 'R', '1915']

6439Z9479rR1915