#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define nmax 500010

long long a[nmax];
int pi[nmax],i,j,sol,r,c,n,ret;

void pref()
{
	int k=0;
	pi[1]=0;
	for (int q=2;q<=n;q++)
	{
		while ((k>0)&&(a[k+1]!=a[q]))
			k=pi[k];
		if (a[k+1]==a[q])
			++k;
		pi[q]=k;
	}
}

int main()
{
	freopen("reguli.in","r",stdin);
	freopen("reguli.out","w",stdout);

	scanf("%d",&n);
	for (i=0;i<n;i++)
		scanf("%lld",a+i);
	for (i=n-1;i>0;i--)
		a[i]=a[i]-a[i-1];
	a[0]=0;
	--n;
	pref();

	sol=0;
	do
	{
		ret=1,++sol;
		r=n%sol,c=n/sol;
		if (pi[n-r]==0)
			ret=0;
		if ((n-r)%(n-r-pi[n-r])!=0)
			ret=0;
		if ((n-r)/(n-r-pi[n-r])!=c)
			ret=0;
	}
	while (!ret)

	printf("%d\n",sol);
	for (i=1;i<=sol;i++)
		printf("%lld\n",a[i]);

	return 0;
}