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]: 18, 18, ['Z', 'w', '4525', 'E', 'x', '2541', '6953', '7899', '483', 'H', 's', 'M', 'c', 'Y', 'X', '2295', '4587', '2621', '4835', '1375', 'v', '9207', '3165']
[EX A]: 1262

[EX Q]: 1, 4, ['6969', 'P', '8161', '6347', 'P', 'S', 'z']
[EX A]: 74361618P9696

[EX Q]: 14, 21, ['9585', 'l', 'O', 'b', '903', 'Z', '2279', 'P', 'k', 'z', '9673', '9925', 'I', 'z', 'A', 'O', '4309', '297', 'F', 'i', '6411', 'q']
[EX A]:
1146iF7929034OAz