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 Input:
13, 17, ['k', 'f', 'C', '1551', 'Y', '2149', 'r', 'R', '5875', 'C', 'Y', '2145', 'O', 'b', 'M', 'y', '7407', 'X', '1227', 'F', 'n']

Ex Output:
7047yMbO


Ex Input:
2, 16, ['6623', 'E', 'S', '8679', '7465', '2769', 'G', '9635', 'Z', 'Y', '6593', '9535', '5247', '2185', '7071', 'P', '7897', 'm']

Ex Output:
P17075812742553593956YZ5369G967256479768SE


Ex Input:
13, 21, ['R', '5869', '5367', '7703', 'w', '5753', 'P', '7797', '1417', 'E', '981', 'p', 'n', '117', 'x', 'k', '9085', 'Y', '4483', 'O', '5267', '669', '6907', '2029', '7571', '1145']

Ex Output:

7625O3844Y5809kx711n