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, 1, ['C', '6223']
answer:
C


question:
5, 7, ['u', '3017', '4149', 'z', '9231', 'C', '7461', 'e']
answer:
1647C1329


question:
6, 9, ['5553', '6311', '3897', '6581', '7935', '75', 'R', 'S', '673']
answer:

376SR57


