#include <bits/stdc++.h>
using namespace std;
int main() {
    int n;
    cin>>n;
    long long int arr[n][n];
    for (int i=0;i<n;i++){
        for (int j=0;j<n;j++){
            cin>>arr[i][j];
        }
    }
    // 池化結果大小為n/2xn/2
    for (int i=0;i<n;i+=2){
        for (int j=0;j<n;j+=2){
            long long int maxVal=arr[i][j];
            // 取該2x2區域最大值
            maxVal=max(maxVal,arr[i][j+1]);
            maxVal=max(maxVal,arr[i+1][j]);
            maxVal=max(maxVal,arr[i+1][j+1]);
            cout<<maxVal<<" ";
        }
        cout<<endl;
    }
    return 0;
}