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:
1, 1, ['N', 'J']
answer:
N


question:
30, 30, ['7149', 't', 'W', '5821', '1189', '4423', 'T', 'x', '5131', '9015', 'H', 'k', 'J', '9951', '5697', '1953', 'X', '8691', '3581', '7319', '6977', '8031', '6179', '2109', 'F', 'Y', 'G', '1065', 'y', '869']
answer:
968


question:
12, 19, ['429', 'n', '589', '7899', '1', 'G', '9051', '9109', '7021', 'c', '7039', 'T', '4635', '4573', '2761', 'z', 'j', 'n', '4031', '7689', 'V', 'h', '6751', 'W', 'Q', '2369', 'v']
answer:

1304njz167237545364T