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]: 5, 9, ['D', 'o', 'D', '7569', '2797', '7801', 'T', 'N', '2223', '7379', 'Y', '9073', 'Z', 'c', 'S', 'a', 'R', '7403', '9927', 'O', '2715', '1133', '9897', 'U']
[EX A]: 3222NT10877972

[EX Q]: 5, 7, ['Y', '5101', 'B', '5129', 'a', 'y', 'v', '4577', '5455', '6685', '6435']
[EX A]: vya

[EX Q]: 1, 3, ['2537', '6621', '9567', 'P']
[EX A]:
765912667352