#include <stdio.h>
#define NODES 6
int graph[6][6]={
	{0,0,1,1,0,0},
	{0,0,0,0,1,0},
	{0,0,0,0,0,1},
	{0,0,0,0,0,1},
	{0,0,0,0,0,1},
	{0,0,0,0,0,0},};
int result[6];
int i=0;

void setline(int line) {
	for (int i=0;i<NODES;i++) { 
		graph[line][i]=0;
	}
}

int judgecol(int col) {
	for (int i=0;i<NODES;i++) {
		if (graph[i][col]) {
			return 0;
		}
	}
	return 1;
}

int main() {
	int isdeleted[NODES]={0,0,0,0,0,0};
	while (!isdeleted[0]||!isdeleted[1]||!isdeleted[2]||!isdeleted[3]||!isdeleted[4]||!isdeleted[5]) {
		int node;
		if (judgecol(0)&&!isdeleted[0]) node=0;
		if (judgecol(1)&&!isdeleted[1]) node=1;
		if (judgecol(2)&&!isdeleted[2]) node=2;
		if (judgecol(3)&&!isdeleted[3]) node=3;
		if (judgecol(4)&&!isdeleted[4]) node=4;
		if (judgecol(5)&&!isdeleted[5]) node=5;
		setline(node);
		isdeleted[node]=1;
		printf("%d ",node+1);
		//if (judgecol(0)&&judgecol(1)&&judgecol(2)&&judgecol(3)&&judgecol(4)&&judgecol(5)) break;
	}
	return 0;
}