/in/foo.cc:4:9: error: stray '\357' in program
 string a；
         ^
/in/foo.cc:4:10: error: stray '\274' in program
 string a；
          ^
/in/foo.cc:4:11: error: stray '\233' in program
 string a；
           ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:5:1: error: expected initializer before 'cin'
 cin >> a;
 ^~~
/in/foo.cc:6:9: error: 'a' was not declared in this scope
 cout << a;
         ^