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, 5, ['B', 'H', 'y', 'y', 'K']
answer:
Ky


question:
8, 19, ['r', '7451', 'X', 'l', 'S', 'v', '4807', '4851', '8849', '3993', 'w', 'Z', '1419', '9185', 'N', '2285', '13', 'm', 'd', 'Y', 'j']
answer:
dm315822N58199141Zw399394881584


question:
3, 27, ['f', 'J', 'Y', 'G', '3181', '4537', 'j', '183', 'g', 'R', '7351', 'r', '6903', '9531', '521', 'C', 'I', 'd', '1361', 'M', '7291', 'I', 'd', '6649', '9169', '1799', '4775']
answer:

5774997196199466dI1927M1631dIC12513593096r1537Rg381j73541813GY