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:
2, 7, ['9969', 'u', '9811', 't', 'z', '8347', 'i', 'O', '5897']

Ex Output:
i7438zt1189u


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:
1, 6, ['y', '7655', '8287', 'z', 'R', '497']

Ex Output:

794Rz78285567y