#include<fstream.h>
 fstream f("date.in", ios::in);
 fstream g("date.out" , ios::out);
 void main()
 { int i,j,n;
   long a[100][100];
   long max=1000000000;
   f>>n;
   for(i=1;i<=n;i++)
   for(j=1;j<=n;j++)
   f>>a[i][j];

   for(i=0;i<=n+1;i++)
   a[0][i]=a[i][0]=a[i][n+1]=a[n+1][i]=max;
   for(i=1;i<=n;i++)
   for(j=1;j<=n;j++)
   if(a[i][j]<a[i-1][j] && a[i][j]<a[i][j-1] && a[i][j]<a[i+1][j] && a[i][j]<a[i][j+1])
   g<<a[i][j]<<" ";
 }