import java.util.*;
import java.math.*;
 
public class Main {
    public static void main(String[] args) {
 		Scanner sc = new Scanner(System.in);
        long a = sc.nextInt();
        long b = sc.nextInt();
        long c = sc.nextInt();
        long d = b*b-4*a*c;
        if(a==0&&b==0&&c==0){
    		System.out.print(-1);
  		}
  		else if(a==0&&b==0){
    		System.out.print(0);
  		}
  		else if(a==0){
    		System.out.println(1);
    		BigDecimal n1 = new BigDecimal(-c);
        	BigDecimal n2 = new BigDecimal(b);
        	System.out.println(n1.divide(n2,50, BigDecimal.ROUND_DOWN));
		}
		else if(d<0){
    		System.out.println(0);
  		}
		else if(d==0){
			System.out.println(1);
			BigDecimal n1 = new BigDecimal(-b);
        	BigDecimal n2 = new BigDecimal(2*a);
        	System.out.println(n1.divide(n2,50, BigDecimal.ROUND_DOWN));
		}
		else{
			System.out.println(2);
			BigDecimal n1 = new BigDecimal(b*b-4*a*c);
        	BigDecimal n2 = new BigDecimal(-b);
        	BigDecimal n3 = new BigDecimal(2*a);
        	BigDecimal n4 = sqrt(n1,50);
        	if(a>0){
				System.out.println((n2.subtract(n4)).divide(n3,50,BigDecimal.ROUND_DOWN));
				System.out.println((n2.add(n4)).divide(n3,50,BigDecimal.ROUND_DOWN));
			}
			else{
				System.out.println((n2.add(n4)).divide(n3,50,BigDecimal.ROUND_DOWN));	
				System.out.println((n2.subtract(n4)).divide(n3,50,BigDecimal.ROUND_DOWN));
			}
		}
    }

    public static BigDecimal sqrt(BigDecimal a, int scale){
        BigDecimal x = new BigDecimal(Math.sqrt(a.doubleValue()), MathContext.DECIMAL64);
        if(scale < 17){
             x = x.setScale(scale, BigDecimal.ROUND_HALF_EVEN);
             return x;
        }
        BigDecimal b2 = new BigDecimal(2);
        for(int tempScale = 16; tempScale < scale; tempScale *= 2){
            x = x.subtract(
                    x.multiply(x).subtract(a).divide(
                    x.multiply(b2), scale, BigDecimal.ROUND_HALF_EVEN));
        }
        return x;
    }
}