#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main(void){
    long long i,j,k,D,N=0;
    long double x1,x2=0;
    scanf("%lld%lld%lld",&i,&j,&k);
    D = j*j - 4*i*k;
    if(i != 0){
        if(D > 0){
            N = 2;
            x1 = (-j - sqrtl(D))/(2*i); 
            x2 = (-j + sqrtl(D))/(2*i);
        }else if(D == 0){
            N = 1;
            x1 = x2 = -j/(2*i);
        }else{
            N = 0;
        }
    }else if(i == 0){
        if(j != 0){
            N = 1;
            x1 = x2 = -k/j;
        }else if(j == 0){
            if(k == 0){
                N = -1;
            }else if(k != 0){
                N = 0;
            }
        }
    }
    
    if(N > 1){
        printf("%lld\n%.14Lf\n%.14Lf,N,x1,x2");
    }else if(N == 1){
        printf("%lld\n%.14Lf", N,x1);
    }else{
        printf("%lld", N);
    }
}