#include<math.h>
main(t){
long a,b,c;long double d;
scanf("%ld%ld%ld",&a,&b,&c);
if(a){
if(a<0){a=-a;b=-b;c=-c;}
d=1.0l*b*b-4.0l*a*c;
fabsl(d)>1e-9?d>0?printf("2\n%.19Lf\n%.19Lf\n",-(sqrtl(d)+b)/a/2,(sqrtl(d)-b)/a/2):puts("0"):printf("1\n%.19Lf\n",-0.5l*b/a);
}else{
b?printf("1\n%.19Lf\n",-1.0l*c/b):puts(c?"0":"-1");
}}