sind

1. first-person plural present of sein
2. second-person polite present of sein
3. third-person plural present of sein

keine

1. feminine nominative/accusative of kein
2. plural nominative/accusative of kein

Briefe

nominative/accusative/genitive plural of Brief "letters"

für

1. for
2. in favor of, in support of
3. by the standards of
4. on behalf of
5. kind / type of
6. (informal) instead of
7. (colloquial) in order to

mich

accusative of ich: me

angekommen

past participle of ankommen