// yukicoder: 40 多項式の割り算
// 2019.6.2 bal4u

#include <stdio.h>

#if 1
#define gc() getchar_unlocked()
#else
#define gc() getchar()
#endif

int in()   // 整数の入力（負数対応）
{
	int n = 0, c = gc();
	if (c == '-') {	c = gc();
		do n = 10*n + (c & 0xf), c = gc(); while (c >= '0');
		return -n;
	}
	do n = 10*n + (c & 0xf), c = gc(); while (c >= '0');
	return n;
}

int a[10005], D;
int ans[3];  // ans: Ax^2 + Bx + C

int main()
{
	int i, d, one, mone;
	
	D = in();
	for (i = 0; i <= D; i++) a[i] = in();
	if (D < 3) {
		for (i = 0; i <= D; i++) ans[i] = a[i];
	} else {
		ans[0] = a[0];
		one = mone = 0;
		for (i = 1; i <= D; i++) {
			one += a[i]; 
			if (i & 1) mone -= a[i]; else mone += a[i];
		}
		ans[2] = (one + mone) >> 1;
		ans[1] = one - ans[2];
	}
	d = 0;
	for (i = 2; i > 0; i--) if (ans[i]) { d = i; break; }
	printf("%d\n", d);
	printf("%d", ans[0]);
	for (i = 1; i <= d; i++) printf(" %d", ans[i]);
	putchar('\n');
	return 0;
}