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, 20, ['A', 'q', '8397', '9869', 'W', 'A', 'J', 'y', '5015', '7315', 'J', '8881', 'J', 'y', 'f', '2681', 'q', '4007', '1301', '6007', '4017', 'm', '6939', '93', '8723', '7797']

Jy50157315J8881Jyf2681q400713016007