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]: 15, 16, ['1107', '1863', 'L', '6929', '9633', '9399', '4479', 'V', 'o', 'x', '1065', '7955', 'i', '7413', '6237', 'S', '1461', '8481', '7143', 's', 'U', 'd']
[EX A]: S7326

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

[EX Q]: 6, 7, ['289', '8397', '5675', 'Y', 'S', 'g', '6595', '8235', '2637', '2621', 'K', 'Q', 'e', 'c', 'x', 'R']
[EX A]:
5956g