instruction:
In this task, you are given inputs 'i', 'j', and A, where 'i' and 'j' are integers and A is a list. A list is shown by two brackets and comma-separated numbers and characters inside, like ['1', '12', 'l']. You need to concatenate all elements of A from the ith element to the jth element, and then reverse the resulting 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 reverse first and then concatenate.
question:
1, 2, ['Q', '6249', 'm', 'H', 'x', 'b', 'Z', 'z', '15']
answer:
9426Q


question:
1, 15, ['5997', '2005', '8529', 'j', 'T', '9729', 'T', 'm', '357', '779', '2253', '725', 'z', '4149', '2913', '8135', 'Q', 'B']
answer:
31929414z5273522977753mT9279Tj925850027995


question:
6, 16, ['L', '7585', 'q', 'L', '1129', '9595', '9825', 'g', 'I', '7521', '3183', 'Z', '6963', 'd', '8869', '4677']
answer:

77649688d3696Z38131257Ig52895959