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 Q]: 6, 16, ['y', 'M', '5237', '1935', '4057', 'W', '1937', '6517', '717', 'i', '8255', '1011', 'A', '3537', '2411', 'U', 'J', 'a', '1591', '2299', 'W', '8383', '8579', '8183', '7473']
[EX A]: U11427353A11015528i71771567391W

[EX Q]: 3, 21, ['V', '3661', '3743', 'Y', '3179', 'b', '7097', '3031', '5859', '4095', 'D', 'J', '2337', '4259', '2539', 'I', '9659', 'U', 'G', 'Q', '3145', '177', '9839', 'f']
[EX A]: 5413QGU9569I935295247332JD5904958513037907b9713Y3473

[EX Q]: 3, 21, ['1863', '8303', 'J', 'V', 'f', '4355', '589', '4961', 'J', '937', 'i', '4955', 'u', '2565', 'd', 'S', 'L', '6623', 'h', 'q', '7385', '4131', '9735', 'J', 'c', 'h', '4235', 'P']
[EX A]:
5837qh3266LSd5652u5594i739J16949855534fVJ