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]: 3, 6, ['p', 'H', '2775', '2567', '7787', 'D', '3807', '4817', '5399']
[EX A]: D787776525772

[EX Q]: 7, 27, ['9785', 'O', '1451', '263', 'V', '9045', 'n', 'K', 'B', '8131', '6137', '437', 'v', 'd', '2787', '3483', '3141', '2151', 'r', 'q', '2981', '4301', '1947', '7631', '8755', 'F', 'W', 'L', 'O']
[EX A]: WF55781367749110341892qr1512141338437872dv73473161318BKn

[EX Q]: 24, 25, ['Z', '9761', 'l', 'A', '331', 'g', 't', '9703', 'p', 'v', '6369', 'U', 'k', '7063', '1243', 'd', 't', 'K', '7045', 'k', 'e', 'Z', '971', 'V', 'B']
[EX A]:
BV