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]: 14, 20, ['9977', 't', 'Y', 'i', '7981', 'a', '1711', '3371', '9143', '3665', '1525', 'y', 'b', '379', 'k', 'T', 'Q', 'D', 'c', '1001', '551', 'Z']
[EX A]: 1001cDQTk973

[EX Q]: 1, 4, ['6193', '5871', '9871', '4821']
[EX A]: 1284178917853916

[EX Q]: 13, 19, ['1615', '9915', 'R', '937', '763', '2605', 'H', '6773', '4853', 'h', 'g', 'S', '8075', 'z', '9245', 'O', '8385', 'W', '9911', 'm', 'J', 'E', '6367', 'c', 'N', '6459', '9763', 'i', 'g', '295']
[EX A]:
1199W5838O5429z5708