#include <vector>
#include <iostream>
#include <unordered_map>


int main() 
{
    int32_t N; std::cin >> N;

    std::vector<int32_t> arr(N);
    std::unordered_map<int32_t, int32_t> mp;
    for(auto i = 0; i < N; ++i) 
    {
        int32_t value;
        std::cin >> value;
        arr[i] = value;
        mp[value]++;
    }

    for(auto&& v : arr)
    {
        if(mp[v] > 1)
        {
            std::cout << v << ' ';
            mp[v] = 0;
        }
    }

    return 0;
}