#include <iostream> #include <vector> #include <algorithm> int main() { int n, m; std::cin >> n >> m; std::vector<int> plates(n + 1, 0); for (int i = 0; i < m; ++i) { int plate; std::cin >> plate; plates[plate] = 1; } for (int i = 1; i <= n; ++i) { if (plates[i] == 0) { std::cout << i << " "; } } std::cout << std::endl; return 0; }