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, 11, ['6519', 'l', '6577', 'z', '4271', 'R', 'O', '7809', 'K', 'V', '4531']
[EX A]: 1354VK9087OR1724z7756l

[EX Q]: 21, 24, ['t', '1315', '1977', '8701', 'w', '2899', '9389', 'c', 'F', '2949', '9591', 'Y', '3127', '5887', 'D', '6527', 'I', '3229', '6585', '5375', '6289', 'j', '1775', 'n', 'O', '4741']
[EX A]: n5771j9826

[EX Q]: 10, 21, ['3617', '871', '5401', '421', 'Z', '8405', 'i', 'F', 'f', '8213', 'p', '3389', 'S', '1151', '1343', '7395', 'x', 'I', '3795', '2257', 'R', 'f', 'B', 'b', '1327', 'd', 'g', 'h', '8895', 'p']
[EX A]:
R75225973Ix593734311511S9833p3128