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, 3, ['4541', 'B', '9655', '8453', 'r', 'i', 'P']
[EX A]: 5569B

[EX Q]: 3, 6, ['A', '6949', '2045', '119', '1373', '9613']
[EX A]: 316937319115402

[EX Q]: 1, 2, ['5209', 'a', '3343', 'z']
[EX A]:
a9025