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, 3, ['N', 'U', 'D', 'm', '9001', 'I', '2675', 'l', '2771', 'U', '1181', 'U']

Ex Output:
DU


Ex Input:
3, 5, ['C', '4345', 'T', 't', 'U', 'p']

Ex Output:
UtT


Ex Input:
1, 2, ['S', 'I', '1333', '2325', 'P', 'U', 'A', '9649', 'd', 'y', '887', 'f', '7483', '4351', 'Q', 'j', '8413', '4699', '9419', '7531', 'z', '3145']

Ex Output:

IS