#include <iostream>
#include <cstdio>
#define MAXN 500050

using namespace std;

long long a[MAXN];
int n, pi[MAXN];

void citire()
{
	long long prev, x;
	scanf("%d\n", &n);
	scanf("%lld", &prev);
	n--;
    for (int i = 1; i <= n; i++) {
		scanf("%lld", &x);
        a[i] = x-prev;
        prev = x;
    }
}

void solution(int ind)
{
    printf("%d\n", ind);
    for (int i = 1; i <= ind; i++)
		printf("%lld\n", a[i]);
}

void solve()
{
	int k = 0;
	pi[1] = 0;
	for (int i = 2; i <= n; i++) {
        while (k && a[i] != a[k+1])
			k = pi[k];
		if (a[i] == a[k+1])
			k++;
		pi[i] = k;
	}
    for (int i = n; i; --i)
		if (2*pi[i]>=i && pi[i]%(i-pi[i]) == 0) {
			if (pi[n]-pi[i] == n-i) {
				solution(i-pi[i]);
				return;
			}
		}
	solution(n);
}

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

    citire();
    solve();

    return 0;
}