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:
5, 5, ['6131', '6209', 'H', 'g', '4529', '491', '2143', '6281']
answer:
9254


question:
4, 9, ['9213', '2865', '1347', 'Y', 'A', '6261', 'E', 'w', 'r', 'B', 'j', '9157', 'r', '485', '8951']
answer:
rwE1626AY


question:
1, 8, ['5129', '999', '4377', '8657', 'u', '9827', '1915', '4795', '6417']
answer:

597451917289u756877349999215