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, 6, ['643', 'X', 'F', '7453', '8495', '7943']
answer:
349759483547F


question:
3, 13, ['9827', '3335', 'K', 'p', '7941', 'U', '4513', 'l', 'B', '179', '9825', '5437', 'u', '7853', '8907', 't', 'V', 'U', 'K', '7159', '6077', 'n']
answer:
u73455289971Bl3154U1497pK


question:
5, 10, ['8489', 'z', 'f', 'Y', '8327', 'm', 's', '1989', '9741', '2177', 'b', '9383', '8035', '8057', 'j', '3045', '5989', 'E', 'o', '3391', '3157', 'n', 'A', '4539', 'T', '9909', 'N', '1647']
answer:

771214799891sm7238