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]: 4, 16, ['S', '5719', '173', 'P', 'a', '5791', 'e', '6279', 'q', '2585', '9533', 'r', '849', 'h', '3259', '3707', '4939', 'X', 'e']
[EX A]: 70739523h948r33595852q9726e1975aP

[EX Q]: 1, 3, ['4523', '3909', 'V', '7275', '5721', '6113', 'G', '5319', '3519']
[EX A]: V90933254

[EX Q]: 2, 2, ['6855', 'L']
[EX A]:
L