import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int D = scan.nextInt();
		int []a = new int[D + 1];
		for(int i = 0; i <= D; i++) {
			a[i] = scan.nextInt();
		}
		scan.close();
		int r0 = a[0];
		int f1 = sub(a, 1);
		int f2 = sub(a, -1);
		//double r1 = (double)(f1 - f2) / 2;
		//double r2 = -r0 + (double)(f1 + f2) / 2;
		int r1 = (f1 - f2) / 2;
		int r2 = -r0 + (f1 + f2) / 2;
		if(r2 == 0) {
			if(r1 == 0) {
				System.out.println(0);
				System.out.println(r0);
			}else {
				System.out.println(1);
				System.out.println(r0 + " " + r1);
			}
		}else {
			System.out.println(2);
			System.out.println(r0 + " " + r1 + " " + r2);
		}

	}
	public static int sub(int[] a, int k) {
		int t = a[0];
		int x = 1;
		for(int i = 1; i < a.length; i++) {
			x = x * k;
			t += a[i] * x;
		}
		return t;
	}
}