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]: 3, 7, ['u', '1307', 'F', '8027', 'r', '4559', 'F', 'm', '9805', '5063']
[EX A]: F9554r7208F

[EX Q]: 7, 12, ['4563', '7657', '4657', '1145', 'A', 'e', 'a', '5429', '3323', 'I', '569', 'R', '5013', 'U', 'v', 'l', 'h', 'z', 'e', 'D', 'n', 'h', 'h', '4673', '973']
[EX A]: R965I32339245a

[EX Q]: 6, 8, ['k', '6105', '7939', 'o', '2585', 'Q', '757', '227', 'M', '7505']
[EX A]:
722757Q