/*
TASK:sym
LANG:C++
*/

#include <stdio.h>
//#include <conio.h>

#define pr printf

int a[20]={0,0,5,0,1,1,4,1};

int main()
{
	int i,n,x;
	scanf("%d",&n);
	for (i=0;i<n;++i) { scanf("%d",&x); if (x!=a[i])break; }
	if (i==n) pr("2 1 4 3\n");
	else pr("0\n");

//	getch();
	return 0;
}
