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]: 1, 2, ['k', 'A', '2153']
[EX A]: Ak

[EX Q]: 4, 9, ['2731', '4987', '2927', '8573', 'O', '8349', '9507', 'K', '7307', 'V']
[EX A]: 7037K70599438O3758

[EX Q]: 14, 18, ['6397', '9137', 'j', 'G', '5561', '8237', '183', 'G', 'c', '3421', '715', 'X', 'A', 'P', '4755', 'E', '7113', 'i', 'R', '8877', '8595', '4127', 'i', 'O', '8643', '5927', 'F', '2515']
[EX A]:
i3117E5574P