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, 21, ['V', '3661', '3743', 'Y', '3179', 'b', '7097', '3031', '5859', '4095', 'D', 'J', '2337', '4259', '2539', 'I', '9659', 'U', 'G', 'Q', '3145', '177', '9839', 'f']

Ex Output:
5413QGU9569I935295247332JD5904958513037907b9713Y3473


Ex Input:
4, 16, ['9593', '3873', 'f', 'l', 'Z', '6157', 'n', 'l', '827', '9127', '143', 'J', '2223', 'A', 'o', '4733', 'C', 'U', 'V', '2613', 'r', 't', 'Q', 'l', 'H', '5189', 'J', 'I']

Ex Output:
3374oA3222J3417219728ln7516Zl


Ex Input:
3, 4, ['6865', 'A', 's', 'o', '1989', 'i', '613', 'S', 's']

Ex Output:

os