#include <bits/stdc++.h>
using namespace std;
int main() {
// your code goes here
long long int n,a[1000000000];
cin>>n;
for(auto i=0;i<n;i++){
cin>>a[i];
}
//sort(a, a + n, greater<int>());
unique(a, a + n);
for(auto i=0;i<n;i++){
cout << a[i]<< endl;
}
return 0;
}
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