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

FILE *read, *write;

int N;
int number_of_solutions = 0;
int queens[5000];

bool goodQueen(int step)
{

	for (int i = 0; i < step; i++)
	{
		if (queens[i] == queens[step] || 
			(step - i == abs(queens[i] - queens[step])))
			return false;
	}

	return true;
}

void print()
{
	for (int i = 0; i < N; i++)
	{
		if (i != N - 1)
			fprintf(write, "%d ",  queens[i]);
		else 
		fprintf(write, "%d\n", queens[i]);
	}

}

void back(int step)
{
	
	for (int i = 1; i <= N; i++)	
	{	
		queens[step] = i;
			
		if (goodQueen(step) == true)
		{
			if (step == N - 1)
			{
				number_of_solutions ++;
				if (number_of_solutions == 1)
					print();
			}
			else
				back(step + 1);		
		}
	}

}

int main()
{

	read = (FILE *) fopen("damesah.in", "r");
	write = (FILE *) fopen("damesah.out", "w");

	fscanf(read, "%d", &N);
	back(0);

	fprintf(write, "%d\n", number_of_solutions);

	fclose(read);
	fclose(write);

	return 0;
}