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]: 5, 5, ['m', '1577', '7895', 'l', 'K', '2981', '8677']
[EX A]: K

[EX Q]: 3, 4, ['3097', 'E', '4255', '1665', '7179']
[EX A]: 56615524

[EX Q]: 1, 2, ['m', '9699']
[EX A]:
9969m