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:
3, 7, ['H', '689', 'd', '6759', '3531', 'd', '8393', 'N', 'd', 'o', '2377', '4065', '8021', 'c']
answer:
3938d13539576d


question:
3, 3, ['5819', '3317', '451', '5811']
answer:
154


question:
2, 21, ['E', 'T', 'O', 'V', 'c', 'y', '3879', 'p', 'M', 'A', 'D', 'Q', '9245', '5167', '423', 'x', 'H', 'Y', 'q', '5253', '2923', 'T', '2711', '5971']
answer:

32923525qYHx32476155429QDAMp9783ycVOT