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, 2, ['S', '7763']

Ex Output:
3677S


Ex Input:
4, 4, ['8393', '8873', '6317', 'N', '2549']

Ex Output:
N


Ex Input:
4, 9, ['1053', '7525', 'e', 'v', '6949', 'I', 'U', 'q', '7145']

Ex Output:

5417qUI9496v