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]: 7, 8, ['4367', '4367', 'm', '5681', '931', '9039', '8313', '6335', 'w', 'd', 'V', '1741', '1703', 'I', 't', 'a', 'P', 'P', 'x']
[EX A]: 53363138

[EX Q]: 3, 3, ['x', 'v', 'p', '4337', '635', '8927', 'B']
[EX A]: p

[EX Q]: 1, 18, ['P', 'o', '4213', 'A', 'r', 'h', '7675', '8031', '3171', 'Q', 'Q', 'u', 'K', '5089', 'F', 'e', 'B', 'W']
[EX A]:
WBeF9805KuQQ171313085767hrA3124oP