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, 5, ['2849', 'J', 'L', '2347', '7219', 'a', 'Q', 'U', '6865', 'O']
[EX A]: 91277432L

[EX Q]: 10, 19, ['V', '2245', '8933', '3669', '7723', 'v', '1895', 'w', 'N', 'g', '3075', 'k', '813', '3569', 'i', 'j', '4087', 'M', '4019', 'n', 'E', 'p']
[EX A]: 9104M7804ji9653318k5703g

[EX Q]: 3, 4, ['4225', 'v', 'p', '4845', 'e', 'l', 'j', '2643', '9607', '5601', '4451', 's', 'f', '1313', 'u', 'u', '5405', '9559', '7217', '8537', '8205', '119', '9767', 'a', 'a', 'x']
[EX A]:
5484p