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:
1, 4, ['6969', 'P', '8161', '6347', 'P', 'S', 'z']

Ex Output:
74361618P9696


Ex Input:
1, 4, ['3633', 'k', '9685', 't']

Ex Output:
t5869k3363


Ex Input:
4, 4, ['5923', '3537', '4549', 'e', '7389', '4895', '9613', '6945', '8905', 'w', 'Z', 'H', '6547', 'X']

Ex Output:

e