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:
1, 1, ['T', 'Y']

Ex Output:
T


Ex Input:
1, 2, ['A', '8103', '7829']

Ex Output:
3018A


Ex Input:
9, 10, ['Q', '9821', '6433', 'x', 'u', 'L', '2489', '1917', '4615', 'B', 'p', 'z', '651', '9783', 'B', 'f', 'Y']

Ex Output:

B5164