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:
2, 11, ['7391', '6663', '477', '4991', '1033', 'c', 'X', 's', '2517', 'i', 'M', '8437', 'J']
answer:
Mi7152sXc330119947743666


question:
3, 3, ['x', 'v', 'p', '4337', '635', '8927', 'B']
answer:
p


question:
5, 12, ['j', 'y', 'a', 'l', 'p', 'r', '4895', '6841', '2963', '1883', '7949', '8653', 'C']
answer:

356894973881369214865984rp