Logical Reasoning series: Solving questions on Alphanumeric series Part III

If you are a candidate preparing to attempt competitive exams be it to study abroad or to crack the government exams, logical reasoning is an integral part of the competitive exam model. Here's a start with solving logical reasoning questions. As much as logical reasoning can be confusing and a tough nut to crack, it can also be fun trying to attempt these questions. Answers for the Alphanumeric Series Part II questions: B @ A 7 N R % 5 $ E 6 K M & 4 S # I U 5 If the symbols followed by vowels interchange their positions, then which element is fourth from the right end?