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:
3, 7, ['H', '689', 'd', '6759', '3531', 'd', '8393', 'N', 'd', 'o', '2377', '4065', '8021', 'c']

Ex Output:
3938d13539576d


Ex Input:
2, 5, ['n', '8897', '6611', '2857', 'p']

Ex Output:
p758211667988


Ex Input:
1, 3, ['Q', 'v', 'U', '1893', 'z', '1265', 'Y', 'R']

Ex Output:

UvQ