var a,b,c,d,x,x1,x2:real;
begin
  write ('a='); read (a);
  write ('b='); read (b);
  write ('c='); read (c);
  d:=b*b-4*a*c;
  if d<0 then writeln ('NO')
         else if d>0 then
                       begin
                         x1:=(-b+sqrt(d))/(2*a);
                         x2:=(-b-sqrt(d))/(2*a);
                         writeln ('x1=',x1:0:2,' x2=',x2:0:2)
                       end
                     else
                       begin
                         x:=-b/(2*a);
                         writeln ('x=',x);
                       end
end.