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, 4, ['6969', 'P', '8161', '6347', 'P', 'S', 'z']
answer:
74361618P9696


question:
18, 23, ['1833', 'M', '3301', '6669', 'K', '7747', 'c', 's', 'd', '6435', 'x', 'Y', '2879', 'R', 'Q', 'R', 'O', 'M', 's', 'd', 'y', '5379', '647', 's', '6155', 'k']
answer:
7469735ydsM


question:
3, 14, ['2169', '6257', '4687', 'J', 'V', '9579', '9661', '5901', '8653', 'l', '6455', 'E', '2217', 'Q', '1113', '3217']
answer:

Q7122E5546l3568109516699759VJ7864