program prazdny;

    var a,b,i,j:integer;
begin
        readln(a);
        readln(b);
        for i:=1 to a do write('*');
        writeln;
        for i:=1 to b-2 do
        begin
            write('*');
            for j:=1 to a-2 do write(' ');
            writeln('*');
        end;
        for i:=1 to a do write('*');
        writeln;

end.