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.

[EX Q]: 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']
[EX A]: 7821ZBueBoa

[EX Q]: 3, 6, ['z', 'b', '2697', 'W', '1449', 'x', '5327']
[EX A]: x9441W7962

[EX Q]: 7, 7, ['B', '5763', '3881', '1881', 'E', 'C', 'l', 'o', '529', '4001', 'L']
[EX A]:
l