Refer to the following letter, number, symbol series and answer the question.
(Left) W # 2 ∞ D @ 4 Y 3 D Ω R 7 & S F @ 6 ^ < X 2 2 (Right)
How many such symbols are there each of which is immediately preceded by a letter and immediately followed by a number?
1
2
2
1
3
3
4
4