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, 6, ['6717', '6639', 'l', 'i', 'o', '1819']

Ex Output:
9181oil9366


Ex Input:
2, 7, ['P', 'Q', 'i', '1593', 'M', '8577', 'd', 'Y']

Ex Output:
d7758M3951iQ


Ex Input:
7, 19, ['479', 'Z', '9241', '7853', '3613', '1097', 'F', '8747', 'j', '395', 'x', '3499', '7983', 'o', '35', 'W', '6331', 'b', 'p']

Ex Output:

pb1336W53o38979943x593j7478F