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, ['S', '411', '3257', 'c', '3483', 'i', 'h', 't']
answer:
114S


question:
3, 6, ['6843', '7805', 'h', '9097', 'O', 'u']
answer:
uO7909h


question:
9, 15, ['M', '6315', 'W', 'P', '99', '887', '2143', 'r', 'w', '5571', 'k', 'T', 'n', '4781', 'H', 'j']
answer:

H1874nTk1755w