Refer to the following letter (Left) O N & # K € S * P # £ * G I & * @ I A * @ © (Right)

Refer to the following letter, symbol series and answer the question. Counting to be done from left to right only.
(Left) O N & # K € S * P # £ * G I & * @ I A * @ © (Right)
How many such letters are there each of which is immediately preceded by a letter and also immediately followed by a symbol?

निम्नलिखित अक्षर–प्रतीक श्रृंखला का ध्यानपूर्वक अध्ययन कीजिए और प्रश्न का उत्तर दीजिए। गणना केवल बाएँ से दाएँ की जानी है:

(बाएँ) O N & # K € S * P # £ * G I & * @ I A * @ © (दाएँ)

ऐसे कितने अक्षर हैं, जिनके ठीक पहले एक अक्षर तथा ठीक बाद में एक प्रतीक है?