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:
6, 14, ['505', 's', '3619', 's', '2871', '6403', 'b', 'M', 'Q', '9645', '9425', 'V', '873', 'l', '2917', 'Q', '9465', 'z', '1513', 'S', 'e', '9733', '7669', 'B']

Ex Output:
l378V52495469QMb3046


Ex Input:
1, 12, ['2851', 'v', '8871', 'Z', '2227', 'm', 'z', 'B', 'v', '765', '1435', 'V', 'X', 'k', '5955', '2549']

Ex Output:
V5341567vBzm7222Z1788v1582


Ex Input:
2, 3, ['k', 'r', '7057']

Ex Output:

7507r