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]: 4, 20, ['H', '7451', 'X', 'i', '951', '1913', '9949', 'W', '4759', '1309', '1981', 'C', 'J', 'F', '4125', 'l', 'i', 'z', 'S', 'R', '5025', '5959', '1323', 'K', 'O', 'x', '5121', 'c', 'C']
[EX A]: RSzil5214FJC189190319574W94993191159i

[EX Q]: 10, 15, ['1135', 'N', '4053', 'k', 'V', '2313', '4827', '549', '23', '223', 'y', 'L', 'r', '7031', '7605']
[EX A]: 50671307rLy322

[EX Q]: 4, 14, ['c', '7797', 'I', 'f', 'j', '6871', '7003', '2781', 'L', '9353', 'V', 'i', '9277', 'V', '6001', '3857', '9659', '8037', 'C', '5389']
[EX A]:
V7729iV3539L187230071786jf