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 find all elements of A from the ith element to the jth element, reverse the order in which they occur, and then concatenate them to output 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. Perform the operations in order, i.e., do not concatenate the elements and then reverse the string.
question:
11, 15, ['Y', 'L', 'I', 'u', 'z', '4077', 'K', '4679', 'l', '9269', '4071', '1789', 'b', '2139', 'b', '111', '6715', 'H', '3981']
answer:
b2139b17894071


question:
8, 21, ['7449', 'R', '469', 'm', 'A', '817', '9583', '239', 'n', '3597', 'C', '6853', '2745', '3827', '5775', 'x', '3875', '7503', '8903', '9679', '819']
answer:
8199679890375033875x5775382727456853C3597n239


question:
1, 18, ['B', 'K', 'k', '6761', 'i', '7529', '1835', '6389', '6987', 'n', 'Q', 'T', '5245', 'X', 'L', '145', '4305', '3059', 'T', '7095']
answer:

30594305145LX5245TQn6987638918357529i6761kKB