#include <iostream>
#include <vector>
using namespace std;

int  N ;
vector<int> v(1000);

void queens( int row ){
      int col;
  row++;
  if( row>N ){
     for ( row = 1; row<=N; row++ ){
  for(  col = 1; col< v[row]; col++){ cout << " ."; }
  cout << " x" ;
  for( ; col< N; col++){ cout << " ."; }
  cout << endl;
}

     exit(0);
  }
  for( col=1; col<=N; col++ ){
    v[row] = col;
    int ok = true;
for(int r=1; r<row; r++ ){
  ok =  ok and (col!=v[r]) and (abs(r-row) != abs(v[r]-col)) ;
}

    if( ok ){ queens( row ); }
} }

int main ( int argv, char ** args ){
   N = atoi( args[1] );
   queens( 0 );
}