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, 6, ['w', '8785', '2921', 'J', 'P', 'g', '9273', '5439', 'O', 'F', 'u', '967', '9007']
[EX A]: gPJ

[EX Q]: 3, 3, ['H', '7843', '2823', '529']
[EX A]: 3282

[EX Q]: 13, 13, ['7873', 'Y', 'q', 'O', '5211', '4033', 'q', 'P', '1023', '9003', '9343', 'j', 'P', '4805', 'Y', 'j', 'G', '2921', 'f', 't', '5413', '4255', '3053', '6053', '5285']
[EX A]:
P