instruction:
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.
question:
2, 15, ['y', '5591', '6581', '7619', '4615', 'S', '5113', '3245', 'q', 'U', '4549', 'v', 'q', '1983', 'b', '3921']
answer:
5591658176194615S51133245qU4549vq1983b


question:
1, 2, ['87', 'd']
answer:
87d


question:
1, 15, ['7751', 'G', 'n', 'L', '901', '7513', '591', '6195', '4133', 'D', '4533', '2763', 'S', '7789', 'x', 'n']
answer:

7751GnL901751359161954133D45332763S7789x