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, ['2661', 'T', '8855', 'I', 'f', 'P']
[EX A]: 5588T

[EX Q]: 2, 3, ['4541', 'B', '9655', '8453', 'r', 'i', 'P']
[EX A]: 5569B

[EX Q]: 2, 6, ['6717', '6639', 'l', 'i', 'o', '1819']
[EX A]:
9181oil9366