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:
20, 26, ['9693', 'i', '8753', 'f', '9131', 'v', '2831', '1541', 's', '8307', '373', 's', 'z', '4929', 'I', '741', 'K', '7767', '2557', 'f', '887', 'g', '779', 'k', '5967', '4947', '2373', '7251', '8841', '3277']
answer:
74947695k977g788f


question:
3, 8, ['b', 'y', '8779', '3949', 'c', 'a', '111', '6649']
answer:
9466111ac94939778


question:
2, 9, ['l', 'u', 'S', '3049', 'o', 'G', 'c', 'O', '5241', 'j']
answer:

1425OcGo9403Su