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, 9, ['g', '309', 'x', '3537', '5995', 'K', '6951', 'x', 'b', '3171', '9079', '7597']

Ex Output:
bx1596K59957353x903


Ex Input:
5, 5, ['6131', '6209', 'H', 'g', '4529', '491', '2143', '6281']

Ex Output:
9254


Ex Input:
3, 3, ['t', '4813', '5023', '4229', 'G', '5203', '1657', 'W', '1341', '2147', '461', '6845', 'L', '6149', 'p', 'M']

Ex Output:

3205