#include <iostream>
using namespace std;
int main(){
int m[51][51];
int n,i,j,k;
cin>>n;
for(i=1;i<=n;i++){
for(j=1;j<=n;j++){
cin>>m[i][j];
}
}
//citire diagonale paralele sub diagonala principala
//si diagonala principala
for(k=1;k<=n;k++){
i=n;
j=k;
while(j>0){
cout<<m[i][j]<<" ";
i--;
j--;
}
}
//citire deasupra diagonalei principale
for(k=n-1;k>=1;k--){
j=n;
i=k;
while(i>0){
cout<<m[i][j]<<" ";
i--;
j--;
}
}
return 0;
}