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:
2, 4, ['o', '5393', 'p', 'h', '5617', 'F', 'I', 'a']
answer:
hp3935


question:
2, 9, ['3441', 'a', 'o', 'B', 'e', 'u', 'B', 'Z', '1287', '323', '5849', 'F', '7917', '1023', '6323', 'A', 'v', '491', '6123', '5949', '1409', 'I', '6889']
answer:
7821ZBueBoa


question:
12, 21, ['T', '1275', 'Z', 'X', '271', 't', '1133', 'J', 'B', '5611', 'f', '2569', 'p', 'x', '5083', 'A', '4461', 'u', 'r', 'E', 'T', '3177', '8537', 'y', '263', '1793']
answer:

TEru1644A3805xp9652


