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:
5, 7, ['B', '7943', 'H', 'E', 'p', 'D', 'L', '625', '2757', '4429', '863', 'z', 'l', 'f', '3467', 'X', '4961', 'T', 'k', '1021', 'T', '2249', 'S', 'D']

Ex Output:
LDp


Ex Input:
3, 13, ['9827', '3335', 'K', 'p', '7941', 'U', '4513', 'l', 'B', '179', '9825', '5437', 'u', '7853', '8907', 't', 'V', 'U', 'K', '7159', '6077', 'n']

Ex Output:
u73455289971Bl3154U1497pK


Ex Input:
9, 17, ['V', '9993', 't', '2281', '8303', '9739', '9663', '655', '5533', 's', 'V', '5461', '241', 'S', 'T', '6983', '3113', '2331', 'f', 'H', 'b', '721', '3715', '7263', 'i', 'Q', 'A', 'n', 'c']

Ex Output:

31133896TS1421645Vs3355