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:
10, 13, ['v', '9787', '3803', 'P', 'M', '7127', '7845', '6369', 'u', '8715', 'I', '7491', '6593', '459', '1747', 'L']
answer:
39561947I5178


question:
2, 4, ['o', '5393', 'p', 'h', '5617', 'F', 'I', 'a']
answer:
hp3935


question:
3, 7, ['7683', '2999', 'a', '7259', 'l', '7375', '2213', 'Z', '5857', 'P', 'C', '1287', '8721', 'k', 'k', 'K', '7529', 'F']
answer:

31225737l9527a