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]: 4, 9, ['g', '6285', 'B', 'l', '5153', 'n', '9751', 'X', 'w', '2291', 'S']
[EX A]: wX1579n3515l

[EX Q]: 5, 16, ['8475', 'y', 'z', 'M', '7495', 'p', '6073', '1545', '9065', '8957', 'z', 'Y', '863', '4153', '3381', '5513', 'K', 'H', '4083', '6175', 'H', '6463', 'G', '5217', 's', 'c']
[EX A]: 315518333514368Yz7598560954513706p5947

[EX Q]: 9, 18, ['583', 'O', 'C', '6917', '5559', '107', '5275', '1341', 'z', '5737', '8591', '1297', 'q', 'u', '4491', 'k', 'Q', 'C', 'u', 'Q', 'X', '1937']
[EX A]:
CQk1944uq792119587375z