import java.math.BigDecimal;
import java.math.MathContext;
import java.util.*;
import java.io.*;
import java.math.*;

class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long a = sc.nextLong();
		long b = sc.nextLong();
		long c = sc.nextLong();
//		for (long a = -10; a <= 10; ++a)
//			for (long b = -10; b <= 10; ++b)
//				for (long c = -10; c <= 10; ++c)
		new Main().run(a, b, c);
	}

	void run(long a, long b, long c) {
		if (a < 0) {
			a *= -1;
			b *= -1;
			c *= -1;
		}
		if (a == 0 && b == 0 && c == 0) {// 0x^2+0x+0=0
			System.out.println(-1);
			return;
		} else if (a == 0 && b == 0 && c != 0) {// 0x^2+0x+c=0
			System.out.println(0);
		} else if (a == 0) {// 0x^2+bx+0=0
			System.out.println(1);
			System.out.println((double) c / a);
		} else if (a != 0) {
			long DD = b * b - 4 * a * c;
			if (DD < 0) {
				System.out.println(0);
			} else if (DD == 0) {
				System.out.println(1);
				System.out.println((double) (-b) / (2 * a));
			} else {
				System.out.println(2);
				System.out.println(BigDecimal.valueOf(-b).subtract(sqrt(new BigDecimal(DD), 50))
						.divide(BigDecimal.valueOf(2 * a), BigDecimal.ROUND_HALF_UP).doubleValue());
				System.out.println(BigDecimal.valueOf(-b).add(sqrt(new BigDecimal(DD), 50))
						.divide(BigDecimal.valueOf(2 * a), BigDecimal.ROUND_HALF_UP).doubleValue());// (double)(-b+Math.sqrt(DD))/(2*a));
			}

		}
		// BigDecimal s2_50 = sqrt(new BigDecimal(2), 50);
		// System.out.println(s2_50);
		// System.out.println(s2_50.multiply(s2_50));
	}

	void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}

	public static BigDecimal sqrt(BigDecimal a, int scale) {
		// とりあえずdoubleのsqrtを求める
		BigDecimal x = new BigDecimal(Math.sqrt(a.doubleValue()), MathContext.DECIMAL64);
		if (scale < 17)
			return x;

		BigDecimal b2 = new BigDecimal(2);
		for (int tempScale = 16; tempScale < scale; tempScale *= 2) {
			// x = x - (x * x - a) / (2 * x);
			x = x.subtract(x.multiply(x).subtract(a).divide(x.multiply(b2), scale, BigDecimal.ROUND_HALF_EVEN));
		}
		return x;
	}
}