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:
4, 4, ['8393', '8873', '6317', 'N', '2549']
answer:
N


question:
2, 4, ['5983', 'I', '9531', 'U', 'P', '1383', 'Y']
answer:
U1359I


question:
4, 6, ['k', '4081', '9317', 'x', '6775', 'b', '7391']
answer:

b5776x