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:
15, 16, ['4531', 'a', 'I', 'W', '1071', '1301', 'v', 's', '3521', '7203', '1157', 'w', '7201', 'a', 'I', 'z', 'V', 'X', 'j']
answer:
zI


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:
9, 25, ['587', 'H', 'j', 'p', 'j', '5265', 'r', '3609', 'X', '8057', '1381', 'x', '5081', 'r', '6037', '8741', '1585', '6037', '8025', 'r', '2161', '9865', '8851', 'S', '4783']
answer:

3874S158856891612r52087306585114787306r1805x18317508X