// 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 main()
{
	int i, D, a, s, t;
	int A, B, C;   // ans: Ax^2 + Bx + C
	
	D = in();
	C = in();
	s = t = 0, i = 1;
	while (D--) {
		a = in();
		s += a;
		if (i) t -= a; else t += a;
		i = !i;
	}
	A = (s + t) >> 1;
	B = s - A;
	if (A) printf("2\n%d %d %d\n", C, B, A);
	else if (B) printf("1\n%d %d\n", C, B);
	else printf("0\n%d\n", C);
	return 0;
}