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]: 2, 2, ['w', '5569', '6229', 'b']
[EX A]: 9655

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

[EX Q]: 5, 16, ['E', '5111', 'D', 'c', 'A', 'f', '9177', '1297', 'U', '7707', 'Q', '3319', 'e', 'D', '1645', '8011']
[EX A]:
11085461De9133Q7077U79217719fA