#include<cstdio>
#include<algorithm>
using namespace std;

int main()
{
	int a[1000],i,n;
	while(scanf("%d",&n)!=EOF)
	{
		for(i=0;i<n;i++)
			scanf("%d",&a[i]);
		sort(a,a+n);
		printf("%d\n",a[n-1]);
		if(n==1)
			puts("-1");
		else
		{
			for(i=0;i<n-1;i++)
				printf(i==n-2?"%d\n":"%d ",a[i]);
		}
	}
	return 0;
}
/**************************************************************
	Problem: 2199
	User: admin
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:1148 kb
****************************************************************/