Program kvur;
label x;
var a,b,c,D: integer;
begin
readln(a,b,c);
D:=b*b-4*a*c;
if D<0 then 
begin
write(0);
goto x;
end;
if a=0 then 
begin
if b<>0 then 
begin
write(1);
write(-c/b:6:2);
goto x;
end
else if c=0 then
begin 
write(-1);
goto x;
end
else begin
writeln(0);
goto x;
end;
end;
if D=0 then 
begin
write(3);
write(-b/2*a:6:2);
goto x;
end;
write(3);
write(((-b+sqrt(D))/2*a):6:2,' ',((-b-sqrt(D))/2*a):6:2);
x:
end.