だい さん しゅ郵便 ゆうびん ものじゃありません
daisanshuyūbimmonojārimasen

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 第三種郵便物

1. It is not third-class mail.; It's not the third kind of mail.

Negative
Polite
Terminal Form