#include <bits/stdc++.h>
using namespace std;
int main() {
list<int> lst;
int x;
while (cin >> x && x != -1) {
lst.push_back(x);
}
lst.sort();
lst.unique();
for (int val : lst) {
cout << val << " ";
}
cout << "\n";
return 0;
}
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