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, 3, ['9937', 'F', 'g', 'B', 'M', 'x', 'n', 'V', '4241', 'Z']
answer:
gF7399


question:
7, 27, ['9785', 'O', '1451', '263', 'V', '9045', 'n', 'K', 'B', '8131', '6137', '437', 'v', 'd', '2787', '3483', '3141', '2151', 'r', 'q', '2981', '4301', '1947', '7631', '8755', 'F', 'W', 'L', 'O']
answer:
WF55781367749110341892qr1512141338437872dv73473161318BKn


question:
5, 11, ['u', '551', '2883', '2753', '33', 'S', '2439', 'z', 'j', '7037', '4887', 'a', '7485', '5867', '3875', '8859', '855', '381', '6511', 'z', 'd']
answer:

78847307jz9342S33