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, 4, ['4047', 'S', '4249', '1735', '207']
[EX A]: 53719424S

[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]: 7, 17, ['3541', '7075', 'a', 'x', '2071', '9921', '2161', '569', '8587', '9469', '1543', 'w', '6417', 'R', 'g', '295', 'P', 'X', '5449', '3427', 'L', '8665', '7575', '7559', 'a', 'u', '4305', 'm', '5719']
[EX A]:
P592gR7146w3451964978589651612