#include <fstream>
using namespace std;

ifstream fin("numere8.in");
ofstream fout("numere8.out");

int main()
{
    int a, n;

    bool exista[10001] = {false};

    while (fin >> a)
        if (a < 10000)
            exista[a] = true;

    for (int i = 9999; i >= 1; --i)
        if (!exista[i])
            fout << i << ' ';

    return 0;
}