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, 10, ['P', '6217', 'k', '761', 'L', 'r', '1897', '1503', '7353', '1055', '6661', 'p', 'p', '4313', 'i', 'P', '5081', '3723', 'x', '8455', 'D', 'l', '1379']
[EX A]: 5501353730517981r

[EX Q]: 4, 14, ['Y', '3111', 'M', 'N', 'l', '721', 'j', '997', 'e', '353', 'd', '167', '5485', 'C', '745', 'x', 'k', '7269', '5835', 'F', 'D', 'Y', 'a', '117']
[EX A]: C5845761d353e799j127lN

[EX Q]: 3, 19, ['9679', '8071', 'l', '9339', 'T', '6693', 'n', '5687', '8345', '6799', '7151', '899', 'b', 'd', '8481', 's', 'g', '1451', 'b', 'K']
[EX A]:
b1541gs1848db9981517997654387865n3966T9339l