#include <iostream>

using namespace std;

int main()
{
    int a[101][101], i, j, n, nr=0, c=1;
    cin>>n;
   for(i=1; i<=n; i++)
       for(j=1; j<=n; j++)
            cin>>a[i][j];


    cout<<endl;
     for(i=1; i<=n; i++)
        a[i][0]=999999999;

    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+1][j] && a[i][j]<a[i][j+1] && a[i][j]<a[i][j-1])
            cout<<a[i][j]<<" ";
        /* if(a[i][j]<a[i-1][j] && a[i][j]<a[i+1][j] && a[i][j]<a[i][j+1])
            cout<<a[i][j]<<" "; */
       }


}