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]: 7, 9, ['s', '3175', '1431', 'a', 'u', '7265', 'N', 'H', '1217', 'x', 'u', 'a', 'c', 'n', 'b', 'J', 'B', '6907', 'D', '6691', 'N', '7959', 'm']
[EX A]: 7121HN

[EX Q]: 1, 12, ['6893', 'o', '2661', 'T', 'w', 'u', 'k', '7727', 'X', '9861', '9125', 'o', 'x', '9109']
[EX A]: o52191689X7277kuwT1662o3986

[EX Q]: 1, 1, ['r', 'D']
[EX A]:
r