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, 6, ['w', '8785', '2921', 'J', 'P', 'g', '9273', '5439', 'O', 'F', 'u', '967', '9007']
answer:
gPJ


question:
2, 6, ['2245', 'H', 'X', '339', '4389', '5331', '6865', '4541', '4845', '6071']
answer:
13359834933XH


question:
1, 4, ['4455', 'E', 'I', '4003']
answer:

3004IE5544