import java.math.BigDecimal;
import java.math.MathContext;
import java.util.Arrays;
import java.util.Scanner;

class Main {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		BigDecimal a = scanner.nextBigDecimal(), b = scanner.nextBigDecimal(), c = scanner.nextBigDecimal();
		if (a.equals(BigDecimal.ZERO)) {
			if (b.equals(BigDecimal.ZERO)) {
				if (c.equals(BigDecimal.ZERO)) System.out.print(-1);
				else System.out.print(0);
			}
			else {
				System.out.println(1);
				System.out.print(BigDecimal.ZERO.subtract(c).divide(b, MathContext.DECIMAL128).toPlainString());
			}
		}
		else {
			BigDecimal d = b.multiply(b).subtract(a.multiply(c).multiply(new BigDecimal(4)));
			if (d.compareTo(BigDecimal.ZERO) == 1) {
				BigDecimal[] e = new BigDecimal[2];
				e[0] = BigDecimal.ZERO.subtract(d.sqrt(MathContext.DECIMAL128)).subtract(b).divide(a.multiply(new BigDecimal(2)), MathContext.DECIMAL128);
				e[1] = d.sqrt(MathContext.DECIMAL128).subtract(b).divide(a.multiply(new BigDecimal(2)), MathContext.DECIMAL128);
				Arrays.sort(e);
				System.out.print(2 + "\n" + e[0].toPlainString() + '\n' + e[1].toPlainString());
			}
			else if (d.equals(BigDecimal.ZERO)) {
				System.out.println(1);
				System.out.print(BigDecimal.ZERO.subtract(b).divide(a.multiply(new BigDecimal(2)), MathContext.DECIMAL128));
			}
			else System.out.print(0);
		}
	}
}