#include <iostream>

using namespace std;

int main( ) {
    unsigned int matrix[30][30], n;
    cin>>n;

    for(unsigned int i=0; i<n; i++)
        for(unsigned int j=0; j<n; j++)
            cin>>matrix[i][j];

    if(matrix[0][0] > matrix[0][1] && matrix[0][0] > matrix[1][0])
        cout<<matrix[0][0]<<" ";

    if(matrix[0][n-1] > matrix[0][n-2] && matrix[0][n-1]>matrix[1][n-1])
        cout<<matrix[0][n-1]<<" ";

    if(matrix[n-1][0] > matrix[n-1][1] && matrix[n-1][0]>matrix[n-2][0])
        cout<<matrix[n-1][0]<<" ";

    if(matrix[n-1][n-1]>matrix[n-1][n-2] && matrix[n-1][n-1]>matrix[n-2][n-1])
        cout<<matrix[n-1][n-1]<<" ";

    for(unsigned int i=1; i<n-1; i++)
        for(unsigned int j=1; j<n-1; j++)
                if(matrix[i][j]>matrix[i-1][j] && matrix[i][j]>matrix[i][j-1] && matrix[i][j] > matrix[i+1][j] && matrix[i][j]>matrix[i][j+1])
                    cout<<matrix[i][j]<<" ";
    return 0;
}