import java.io.InputStream;
import java.io.PrintWriter;
import java.lang.reflect.Array;
import java.math.BigDecimal;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.PriorityQueue;
import java.util.Queue;
import java.util.Scanner;
import java.util.Set;
import java.util.Stack;
import java.util.TreeMap;
import java.util.TreeSet;

import static java.util.Comparator.*;

public class Main {
    public static void main(String[] args) {
        PrintWriter out = new PrintWriter(System.out);
        Solver solver = new Solver(System.in, out);
        solver.solve();
        out.close();
    }
}
class Solver {
	Scanner sc;
	PrintWriter out;
    public Solver(InputStream in, PrintWriter out) {
    	sc = new Scanner(in);
    	this.out = out;
    }
    // ==================================================================
    public void solve() {
    	long A = Long.parseLong(sc.next());
    	long B = Long.parseLong(sc.next());
    	long C = Long.parseLong(sc.next());
    	if(A == 0 && B == 0) {
    		if(C == 0)	out.println(-1);
    		else 		out.println(0);
    	} else if(A == 0) {
    		out.println(1);
   			out.println(String.format("%.14f", (double)C/B));
    	} else if(B == 0) {
    		if(C == 0) {
    			out.println(1);
    			out.println(0);
    		} else if((long)A * C < 0) {
    			out.println(0);
    		} else {
    			double X = Math.sqrt((double)C*-1/A);
    			out.println(2);
       			out.println("-" + String.format("%.14f", X));
       			out.println(String.format("%.14f", X));
    		}
    	} else if(C == 0) {
    		out.println(2);
    		if(B > 0) {
    			out.println(String.format("%.14f", (double)B * -1 / A));
    			out.println(0);
    		} else {
				out.println(0);
				out.println(String.format("%.14f", (double)B * -1 / A));
    		}
    	} else if((B*B - 4*A*C) < 0) {
    		out.println(0);
    	} else {
    		double wk = Math.sqrt(B*B - 4*A*C);
    		if(wk == 0) {
    			out.println(1);
    			out.println(String.format("%.14f", ((double)B * -1) / A / 2));
    		} else {
    			out.println(2);
				out.println(String.format("%.14f", ((double)B * -1 - wk) / A / 2));
				out.println(String.format("%.14f", ((double)B * -1 + wk) / A / 2));
    		}
    	}
    }
}