#include <stdio.h>
#include <quadmath.h>
#include <dlfcn.h>

#define LoadLibraryA(s) dlopen(s,2)
#define GetProcAddress dlsym
#define FreeLibrary dlclose

typedef __float128 (*type_sqrtq)(__float128);
typedef int (*type_quadmath_snprintf)(char *s, size_t size, const char *format, ...);
type_sqrtq mysqrtq;
type_quadmath_snprintf myquadmath_snprintf;

char buf[99];
int main(){
	//void *H=LoadLibraryA("/usr/local/lib/gcc/9/libquadmath.dylib");
	void *H=LoadLibraryA("/usr/lib64/libquadmath.so");
	mysqrtq=(type_sqrtq)GetProcAddress(H,"sqrtq");
	myquadmath_snprintf=(type_quadmath_snprintf)GetProcAddress(H,"quadmath_snprintf");

	int T;
	long long a,b,c;
	__float128 d;
	//for(scanf("%d",&T);T--;){
		scanf("%lld%lld%lld",&a,&b,&c);
		if(!a){
			if(!b)puts(c?"0":"-1");
			else printf("1\n%.12Lf\n",-c*1.0L/b);
		}else{
			if(a<0)a=-a,b=-b,c=-c;
			__float128 _a=a,_b=b,_c=c;
			d=_b*_b-4.0Q*_a*_c;
			if(d<0)puts("0");
			else if(d==0)printf("1\n%.12Lf\n",-b/2.0L/a);
			else{
				puts("2");
				myquadmath_snprintf(buf,99,"%.12Qf",(-_b-mysqrtq(d))/2/_a);
				puts(buf);
				myquadmath_snprintf(buf,99,"%.12Qf",(-_b+mysqrtq(d))/2/_a);
				puts(buf);
			}
		}
	//}
	return 0;
}