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:
3, 21, ['V', '3661', '3743', 'Y', '3179', 'b', '7097', '3031', '5859', '4095', 'D', 'J', '2337', '4259', '2539', 'I', '9659', 'U', 'G', 'Q', '3145', '177', '9839', 'f']
answer:
5413QGU9569I935295247332JD5904958513037907b9713Y3473


question:
10, 19, ['6733', 'q', '2197', 'h', '9975', '3059', 'e', '8475', '281', 'L', '9119', 'B', '8857', 'U', 'R', 'h', 'e', 'J', 'P', 'l']
answer:
PJehRU7588B9119L


question:
8, 19, ['3925', '2263', 'U', 'W', 'L', '1333', '3395', 'h', '9825', '7473', 'f', 'D', 'D', 'z', '1903', '8935', '1289', 'E', '8699', '5347', '3817', '3009']
answer:

9968E982153983091zDDf37475289h