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, 5, ['f', 'd', '2691', 't', 'u']
[EX A]: ut1962d

[EX Q]: 2, 2, ['a', 'J']
[EX A]: J

[EX Q]: 14, 16, ['b', '2473', 'R', 'E', '7043', 'U', '7423', 's', 'b', 'L', '2429', '8873', 't', 'Z', 'p', 'b', '5259', 'L', '9701', 'y', '9127', 'e', 'y']
[EX A]:
bpZ