#include <bits/stdc++.h>
using namespace std;
int main(){
int n,m;
cin>>n;
int a[1010];
int x[1010];
int y[1010];
for (int i=1;i<=n;i++){
cin>>a[i];
}
for (int i=1;i<=n;i+=2){
cout<<a[i]<<" ";
}
cout<<endl;
for (int i=2;i<=n;i+=2){
cout<<a[i]<<" ";
}
}