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:
9, 19, ['2139', '6849', 'b', '9459', 'v', 'h', 'i', '7977', 'q', 'Z', '7577', 'P', '9971', 'c', '567', 'J', '693', 'N', 'r']
answer:
qZ7577P9971c567J693Nr


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


question:
2, 5, ['6691', '401', '423', '5731', 'e', '3369', '9145']
answer:

4014235731e