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, 5, ['f', 'd', '2691', 't', 'u']
[EX A]: ut1962d

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

[EX Q]: 2, 9, ['7539', 'U', 'D', '1871', 'e', 'y', '3525', '8301', '6925', '2337', '2689', '9937']
[EX A]:
529610385253ye1781DU