Study the following arrangement of letters, numbers, symbols and answer the question that follows.
(Left) € A 5 # 6 λ 5 D P A ¥ 8 R 2 Z * Q 9 B L 5 6 % $ H 2 F # 6 (Right)
How many such letters are there in the above series, each of which is immediately preceded by a symbol and immediately followed by a number?
1
1
2
3
3
4
4
2