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:
8, 12, ['K', 'x', 'a', 'A', '6203', '117', '1007', '6063', '569', '9809', '9097', 'w', '3939', 'l', 'V']
answer:
w790990899653606


question:
3, 10, ['9543', '2797', '3939', '8207', '329', 'l', '5353', '8849', '5579', '7445']
answer:
5447975594883535l92370289393


question:
12, 12, ['4033', '9871', '9985', '4095', 'I', '4015', '337', 'c', '3047', 'c', 'x', '6781', 'M']
answer:

1876