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, 9, ['u', 'f', 'Q', 'z', 'Y', 'x', '1237', 'T', '5395', 'E', 'D', 'E', 'd', '2319', '8825', '711', '6667', '3109', 'b']

Ex Output:
5935T7321xYzQfu


Ex Input:
2, 2, ['1467', 'm']

Ex Output:
m


Ex Input:
3, 6, ['C', 'g', 'w', '1191', 'M', '8751']

Ex Output:

1578M1911w