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:
2, 8, ['O', '4833', '7055', '9891', '9117', '1571', 'S', 'Z', '7741', 'W', 't']
answer:
ZS17517119198955073384


question:
1, 3, ['r', '5153', 'I']
answer:
I3515r


question:
2, 2, ['M', 'v']
answer:

v