/in/foo.cc: In function 'int main()':
/in/foo.cc:4:11: error: 'A' was not declared in this scope
     cout<<A<<endl;
           ^
/in/foo.cc:5:11: error: 'AAA' was not declared in this scope
     cout<<AAA<<endl;
           ^~~
/in/foo.cc:6:11: error: 'AAAAA' was not declared in this scope
     cout<<AAAAA<<endl;
           ^~~~~
/in/foo.cc:7:11: error: 'AAAAAAA' was not declared in this scope
     cout<<AAAAAAA<<endl;
           ^~~~~~~