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:
1, 2, ['E', 'W', '2117']
answer:
EW


question:
1, 5, ['Q', 'J', '983', 'W', 'b']
answer:
QJ983Wb


question:
8, 18, ['2477', '6337', '7731', 'p', '4133', 'S', '6221', '339', '5753', 'm', '1171', 's', 'T', '4175', 'Q', 'T', 'k', '1735', '9823', '533']
answer:

3395753m1171sT4175QTk1735


