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]: 2, 6, ['2245', 'H', 'X', '339', '4389', '5331', '6865', '4541', '4845', '6071']
[EX A]: 13359834933XH

[EX Q]: 12, 13, ['w', '2825', '7553', '5565', '4973', '1763', '4755', 'c', 'y', '6241', '7527', '7701', '865']
[EX A]: 5681077

[EX Q]: 12, 21, ['M', 'Z', '2057', '57', '1853', 'C', '1907', '2563', '5603', 'A', 'o', '7463', 'e', '6109', '2901', 'z', 'P', '6069', 'J', 'L', 'S', '2301', 'h', '8817']
[EX A]:
SLJ9606Pz10929016e3647