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, 15, ['U', 'z', '9255', 'F', 'G', '7403', '6287', 'm', 'P', '4715', '1613', 'G', '1911', 'S', '8823', '9415', 'z', '6359', '1225', 'T', 'z', '1557', 'r', 'M', 'i', '5047', 'b', 'W']
[EX A]: 3288S1191G31615174Pm78263047G

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

[EX Q]: 6, 7, ['4305', 'i', '4357', '7031', '6747', '8469', '9097', 'A', '4559', '7151', '4647']
[EX A]:
79099648