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]: 10, 13, ['3493', '8321', '8153', 'Y', 'A', 'H', 'z', 'D', 'G', '3563', 'O', '697', '7357', 'F', 'V', '515', 'a', 't']
[EX A]: 7537796O3653

[EX Q]: 4, 4, ['Z', '7465', 'J', 'W']
[EX A]: W

[EX Q]: 2, 6, ['b', '869', 'n', '6141', '2657', '5919', 'x', 'k', 'n', 'U', '9237']
[EX A]:
919575621416n968