#include <iostream>
using namespace std;
int main() {
int a[10000], n, i, g[10000], k = 0;
cin >> n;
for (i = 0; i < n; i++)
cin >> a[i];
for (i = 0; i < n; i = i + 3){
g[k] = a[i];
k++;
}
for (i = 0; i < k; i++){
cout << g[i]<<" ";
}
}
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