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, 10, ['1183', '2299', 'O', '963', 'E', '9319', 'L', 'R', '1293', '8707', 'n', 'D', '6721', '2219', '3293', 'J', '4673', '325', '285', '5331']
[EX A]: 70783921RL9139E369O9922

[EX Q]: 3, 7, ['5115', '3679', '9619', '8895', 'S', 'T', '5735', 'H', 'a']
[EX A]: 5375TS59889169

[EX Q]: 2, 10, ['7037', 'k', 'x', '2035', '2345', '1465', 'k', 'm', '1149', '639']
[EX A]:
9369411mk564154325302xk