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, 2, ['8679', 'G', '1819']

Ex Output:
G


Ex Input:
1, 4, ['6193', '5871', '9871', '4821']

Ex Output:
1284178917853916


Ex Input:
3, 7, ['373', 'H', '5721', '7511', '3673', '5953', '3119', 'B', 'm', '6531', '8153', '8103', '8223', 'b', 'x', '7823', '2265', 'a']

Ex Output:

91133595376311571275