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]: 13, 15, ['L', 'A', '2959', 'g', '7157', '9131', 'o', 'D', 'q', 'd', 'A', '4249', 'K', 'U', '4805', 'h', '7981']
[EX A]: 5084UK

[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]: 18, 18, ['6845', 'F', '453', '7549', 'Y', 'Q', 'P', '2941', '7175', 'X', '5195', 'V', 'f', 'g', '3963', '1125', 'U', '445', '3921', 'F', 'D', 'G', '3857', 'V', 'T', 'x']
[EX A]:
544