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]: 3, 4, ['E', 'k', '4697', 'f', 'J', 's', '1265', '4673', 'D', '3345', 'n', '5593', '2249', '5951']
[EX A]: f7964

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

[EX Q]: 16, 28, ['T', 'o', '1103', '3383', '565', 'p', '6631', '6175', '1689', '1943', '7507', 'f', '627', '7713', 'B', 'w', 'R', '1443', 'u', '7543', '4443', 'Q', 'm', 'x', 'W', '1233', '2551', 'Z', 'k']
[EX A]:
Z15523321WxmQ34443457u3441Rw