Most used alphabet 'e'

Scene: Cryptography class

'The most used alphabet in english language is e', He kept on. 'This is key point in solving any coded language.' Some of his students noted this down. But he noticed that one of the last bencher wasnt writing anything down, instead was smirking... Feeling offended he asked that student to stand up. He asked that guy if there was anything funny or unusual with his sentence. That was the basic clue to solve almost all the cryptographic languages. But that student kept smirking, and started writing something on a paper.

The student gave paper to him and said, 'Sir, last week i deciphered this code after trying out for 3 days, give it a try...' He took that paper, started working on it. But something was not proper with the cipher, also, he was getting restless because of the student's smirk. Finally, after 1hr of hardwork, and after getting nowhere in solving the cipher; he asked student to help. Student wrote a line below the ciphered paragraph, 'ts mdrn dys sir. mst usd alphbt s nt 'e', instd ts mst drppd alphbt...'

Fr frst tym in hs lyf, he ws spchlss.....