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:
4, 13, ['6993', '5601', 'n', 'J', 'E', 'M', 'd', 'T', 'V', 'C', '4969', 'J', 'F']
answer:
FJ9694CVTdMEJ


question:
1, 3, ['8359', '9605', '5185']
answer:

581550699538