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]: 6, 11, ['B', 'j', '911', 'A', '7195', 'm', '7177', 'X', '2015', 't', 'P', 'x', 'F']
[EX A]: Pt5102X7717m

[EX Q]: 1, 2, ['735', 'W', '5879', '8259']
[EX A]: W537

[EX Q]: 26, 26, ['161', '823', '7539', '8149', '1461', 'r', 'e', '9733', 'H', '5525', '4595', 'R', 'k', 'C', 'v', 'd', '2347', '781', 'Q', 'F', '697', '279', '2435', 'U', '4465', 'X', '7367', '6337', '6213', 'l']
[EX A]:
X