Refer to the following number and symbol series and answer the question that follows.

Refer to the following number and symbol series and answer the question that follows. Counting to be done from left to right only.
निम्नलिखित संख्या और प्रतीक श्रृंखला का संदर्भ लीजिए तथा दिए गए प्रश्न का उत्तर दीजिए। गिनती केवल बाएँ से दाएँ की जानी है।
(Left) @ 3 6 7 & 8 # & + $ 1 ? 9 1 + 7 1 # # < 2 (Right)
How many such symbols are there, each of which is immediately preceded by another symbol and also immediately followed by a number?
ऐसे कितने प्रतीक हैं, जिनमें से प्रत्येक के ठीक पहले एक और प्रतीक है तथा ठीक बाद एक संख्या है?